1. Dyachenko, C.V., Zhidkova, E.G., Malysheva, A.V., Ronjko, R.V., Ter-Avanesova, A.V. Ekspediciya v Opocheczkij rajon Pskovskoj oblasti [Expedition to the Opochka District of the Pskov Region]. Russkij yazyk v nauchnom osveshhenii [Russian Language in Scientific Lighting], 2018, No. 2 (36), pp. 257–313. (In Russ.)
2. Zakharova, K.F., Orlova, V.G. Dialektnoe chlenenie russkogo yazyka [Dialect Division of the Russian Language]. Moscow, Prosveshhenie Publ., 1970. (In Russ.)
3. Dyachenko, C.V., Zhidkova, E.G., Ter-Avanesova, A.V. Formy perfekta i perfektnye konstrukcii v govorax pod Opochkoj [Perfect Forms and Perfect Constructions in Opochka Dialects]. Trudy Instituta russkogo yazyka im. V.V. Vinogradova [Proceedings of the V.V. Vinogradov Russian Language Institute]. No. 22, 2019, pp. 213–229. (In Russ.)
4. Ronjko, R.V. Materialy ekspedicii 2019 g. v Opocheczkij rajon Pskovskoj oblasti: teksty s kommentariem [Expedition to Opochka District of the Pskov Region in 2019: Texts and a Brief Coomentary]. Russkij yazyk v nauchnom osveshhenii. [Russian Language in Scientific Lighting]. 2019, No. 1, pp. 234–258. (In Russ.)
5. Trubinsky, V.I. Rezultativ, passiv i perfekt v nekotorykh russkikh govorakh [Resultative, Passive and Perfect Forms in Some Russian Dialects]. Tipologiya rezultativnykh konstrukcij (rezultativ, stativ, passiv, perfekt) [Typology of the Resulative Constructios (Resultative, Stative, Passive, Perfect)]. Leningrad, Nauka Publ., 1983, pp. 216–226. (In Russ.)
6. Shulga, M.V. Grammaticheskie oppozicii v istorii morfologii imeni [Grammatical Oppositions in the History of the Morphology of the Name]. Moscow, Indrik Publ., 2017. (In Russ.)
7. Shulga, M.V. Deeprichastiya na -i v svete pamyatnikov vostochnoslavyanskoj pismennosti [Gerunds in -i in the Light of the East Slavic Texts]. Pam,yatki pisemnosti sxidnoslav,yanskimi movami XI–XVIII stolit [East Slavic Texts of the 11–18th cc.]. Kiev, Naczionalna akademiya nauk Ukraїni Publ., 1997, No. 3. (In Russ.)
8. Kuzmina, I.B., Nemchenko, E.V. Sintaksis prichastnyykh form v russkikh govorakh [The Syntax of the Participial Forms in Russian Dialects]. Moscow, Nauka Publ., 1971. (In Russ.)
9. Seržant, I.A. The so called possessive perfect in North Russian and the Circum-Baltic area. Adiachronic and areal account. Lingua. 2012. 122 (4). P. 356–385. doi: 10.1016/j.lingua.2011.12.003
10. Pozhariczkaya, S.K. O semantike nekotoryx form proshedshego vremeni glagola v severnorusskom narechii [On the Semantics of Some Past Tense Forms in the Northern Russian Dialects]. Revue des Études slaves. Paris, 1991. LXIII/4. (In Russ.)
11. Pozhariczkaya, S.K. Otrazhenie evolyucii drevnerusskogo plyuskvamperfekta v govorax severnorusskogo narechiya Arxangel`skoj oblasti [Reflection of the Evolution of the Old Russian Pluperfect in the Northern Russian Dialects of the Arkhangelsk Region]. Obshheslavyanskij lingvisticheskij atlas: Materialy i issled. 1991–1993 gg. [General Slavic Linguistic Atlas: Materials and Research. 1991–1993]. Moscow, IR’A RAN Publ., 1996, pp. 268–279. (In Russ.)
12. Pozhariczkaya, S.K. Konstrukcii s glagolom byt (byl, byla, bylo, byli) v odnom severnorusskom govore: k voprosu o plyuskvamperfekte [Constructions with the Verb to be (byl, byla, bylo, byli) in one Northern Russian Dialect: on the Quiestion of the Pluperfect] Contemporary Approaches to Dialectology. The Area of North, North-West Russian and Belarusian Dialects. Ed. by Ilja A. Seržant & Björn Wiemer. Bergen, 2014. P. 216–244. (In Russ.)
13. Russkaya dialektologiya. Pod red. prof. N. A. Meshherskogo [Russian Dialectology. Prof. A. Meshhersky (ed.)]. Moscow, Vysshaya shkola Publ., 1972. (In Russ.)
14. Morzova, N.A., Chekmonas, V.N. K probleme grammaticheskogo statusa i znacheniya sochetanij bytprosh. + l-ovye formy glagola v staroobryadcheskikh govorakh Litvy [On the Problem of the Grammatical Status and Semantics of the Constructions byt’ past + l-forms in Old Believer Dialects of Lithuania]. Pskovskie govory: sinkhroniya i diakhroniya. Mezhvuzovskij sbornik nauchnykh trudov [Pskov Dialects: Synchrony and Diachrony. Interuniversity Collection of Scientific Papers]. Pskov, 2003, pp. 206–223. (In Russ.)
15. Sitchinava, D.V. Tipologiya plyuskvamperfekta. Slavyanskii plyuskvamperfekt [A Typology of Pluperfect. Slavic Pluperfect]. Moscow, AST-PRESS Publ., 2013. (In Russ.)
16. Nedyalkov, V.P., Yakhontov, S.E. Tipologiya rezultativnykh konstrukcij [Typology of the Resulative Constructios]. Tipologiya rezultativnykh konstrukcij (rezultativ, stativ, passiv, perfekt) [Typology of the Resulative Constructios (Resultative, Stative, Passive, Perfect)]. Leningrad, Nauka Publ., 1983, pp. 5–41. (In Russ.)
17. Maslov, Yu.S. Rezultativ, perfekt i glagolnyj vid [Resultative, Perfect and Aspect]. Tipologiya rezultativnykh konstrukcij (rezultativ, stativ, passiv, perfekt) [Typology of the Resulative Constructios (Resultative, Stative, Passive, Perfect)]. Leningrad, Nauka Publ., 1983, pp. 41–54. (In Russ.)
18. Plungyan, V.A. K tipologii perfekta v yazykakh mira: Predislovie [Towards the Typology of Perfect in the World’s Languages. Preface]. ACTA LINGUISTICA PETROPOLITANA. Trudy Instituta lingvisticheskix issledovanij RAN. T. XII. Ch. 2. Issledovaniya po teorii grammatiki. Vypusk 7: Tipologiya perfekta. Otv. red. T.A. Majsak, V.A. Plungyan, Ks.P. Semyonova [ACTA LINGUISTICA PETROPOLITANA. Proceedings of the Linguistic Research Institute of the Russian Academy of Sciences. Vol. 2. Part 2. Studies in the Theory of Grammar. No. 7. T.A. Majsak, V.A. Plungyan, Ks.P. Semyonova (Eds.)]. St. Petersburg, Nauka Publ., 2016, pp. 7–36. (In Russ.)
19. Trubinsky, V.I. Ocherki russkogo dialektnogo sintaksisa [On the Russian Dialectical Syntax]. Leningrad, Leningradskij Universitet Publ.,1984. (In Russ.)
20. Danylenko, A. Is there any possessive perfect in North Russian? WORD, 2005, 56:3, 347–379. DOI: 10.1080/00437956.2005.11432554
21. Jung, H. Conditioning factors in the development of the -vši perfect in West Russian. Contemporary Approaches to Dialectology. The Area of North, North-West Russian and Belarusian Dialects. Ed. by Ilja A. Seržant & Björn Wiemer. Bergen, 2014, 195–215.
22. Wiemer, B. Slavic Resultatives and Their Extensions: Integration into the Aspect System and the Role of Telicity. SLAVIA, 2–17, 86: 2–3; 124–168.
23. Ryko, A.I. Prichastiya na -shi v odnom zapadnorusskom govore toropeczko-xolmskogo regiona [Participals in -shi in one West Russian Dialect of the Toropets-Kholm Region]. Russkij yazyk v nauchnom osveshhenii [Russian Language in Scientific Lighting]. 2002, No. 2 (4), pp. 171–193. (In Russ.)
24. Plungyan, V.A. Antirezultativ: do i posle rezultata [Antiresultative: Before and After the Result]. Issledovaniya po teorii grammatiki, 1: Glagolnye kategorii [Grammar Theory Researches. Vol. 1. Grammatical Categories]. Moscow, Gnosis Publ., 2001, pp. 50–88. (In Russ.)
25. Sheveleva, M.N. “Russkiy plyuskvamperfektˮ v drevnerusskikh pamyatnikakh i sovremennykh govorakh [“Russian Pluperfectˮ in the Old Russian Texts and Modern Dialects]. Russkiy yazyk v nauchnom osveshchenii [Russian Language in Scientific Lighting]. 2007, No. 2 (14), pp. 214–252. (In Russ.)
26. Skachedubova, M.V. Funktsionirovaniye -l-formy v drevnerusskom narrative (na materiale rannikh letopisey) [Functioning of the -l-form in Old Russian Narrative (Based on Early Chronciles)]. Phil. cand. diss. V.V. Vinogradov Russian Language Institute, Мoscow, 2019. (In Russ.)
27. Ermolova, M.V. O nekotoryx glagolnykh osobennostyakh v zapadnorusskikh letopisyakh (sochetaniya “byti + prichastie na -sh-/-vsh-ˮ, plyuskvamperfekt) [On Some Verbal Features in Western Russian Chronicles (Constructions “быти + participle in -ъш - / - въш-ˮ, Subjunctive Mood II, Pluperfect)]. Issledovaniya po slavyanskoj dialektologii [Studies in Slavic Dialectology]. No. 23. Moscow, In-t slavyanovedeniya RAN Publ., 2001, pp. 178–193. (In Russ.)
28. Petrukhin, P.V., Sitchinava, D.V. “Russkij plyuskvamperfektˮ v tipologicheskoj perspektive [“Russian pluperfectˮ in the Typological Perspective]. Verenitsa liter: K 60-letiyu V. M. Zhivova. [A String of Letters: To the 60th Anniversary of V.M. Zhivov]. Moscow, Yazyki slavyanskoi kultury Publ., 2006, pp. 193–214. (In Russ.)
29. Sichinava, D.V. “Sdvig nachalnoj tochkiˮ: upotreblenie nekotorykh glagolnykh form v introduktivnoj funkcii [“Shift of Initial Pointˮ: Introductory Use of Some Verbal Forms]. Issledovaniya po teorii grammatiki, 4: Grammaticheskie kategorii v diskurse. V.A. Plungyan, V.Yu. Gusev i A.Yu. Urmanchieva (red.) [Studies in the Theory of Grammar, 4: Grammatical Categories in Discourse]. Moscow, Gnosis, Publ., pp. 241–274. (In Russ.)
30. Deyanova, M. Istoriya na slozhnite minali vremena v bulgarski, surbo-hurvatski i slovenski ezik [History of the Compound Past Tenses in Bulgarian, Serbo-Choratian and Slovenian]. Sofia, Izdatelstvo na bulgarskata akademiya na naukite Publ., 1970. (In Bulg.)
31. Kowalska, A. Ewolucja analitycznych form czasownikowych z imiesłowem na -Ł w języku polskim. [Evolution of the Analytical Verbal Forms with the l-participle in Polish]. Katowice, 1976. (In Pol.)
32. Friedman, V.A. The Pluperfect in Albanian and Macedonian. Folia Slavica. 1981. (Columbus, OH) 4, 2–3, 273–282.
33. Fridman, V. O differenciacii temporalnosti i aspektualnosti v bolgarskom i makedonskom yazykakh [On the Differentiation of Temporality and Aspectuality in the Bulgarian and Macedonian Languages]. Voprosy yazykoznaniya [Topics in the Study of Language]. 1991, No. 1, pp. 116–124. (In Russ.)
34. Fici, F. Macedonian perfect and its modal strategies. Makedonski jasik [Macedonian language], 2001, LI–LII, pp. 61–88.
35. Graves, N. Macedonian – a language with three perfects? Dahl, O. (ed.) 2000. Tense and Aspect in the Languages of Europe. B., N.Y.: Mouton de Gruyter, 479–494.
36. Makarova, A.L. O formah i funkciyakh perfekta v zapadnomakedonskikh dialektakh [On the Perfect Forms and Functions in West Macedonian Dialects]. ACTA LINGUISTICA PETROPOLITANA. Trudy Instituta lingvisticheskix issledovanij RAN. T. XII. Ch. 2. Issledovaniya po teorii grammatiki. Vypusk 7: Tipologiya perfekta. Otv. red. T.A. Majsak, V.A. Plungyan, Ks.P. Semyonova [ACTA LINGUISTICA PETROPOLITANA. Proceedings of the Linguistic Research Institute of the Russian Academy of Sciences. Vol. 2. Part 2. Studies in the Theory of Grammar. No. 7. T.A. Majsak, V.A. Ks.P. Plungyan, Semyonova (Eds.)]. St. Petersburg, Nauka Publ., 2016, pp. 217–234. (In Russ.)
37. Sitchinava, D.V. K probleme proiskhozhdeniya slavyanskogo uslovnogo nakloneniya. [On the Slavic Conditional Mood’s Origin]. Issledovaniya po teorii grammatiki, 3: Irrealis i irrealnost [Studies in the Theory of Grammar, 3: Irrealis and Unreality]. Мoscow, Gnosis Publ., 2004, pp. 292–312. (In Russ.)
38. Sitchinava, D.V. Drevnerusskie indikativnye formy so vspomogatelnym byh: k interpretacii i spisku primerov [Old Russian Indicative Forms with the Auxiliary byh: on the Interpretation and List of Examples]. Sub specie aeternitatis: Sbornik nauchnyh statej k 60-letiyu Vadima Borisovicha Krysko [Sub specie aeternitatis: Collection of Scientific Articles Dedicated to the 60th Anniversary of Vadim Borisovich Krysko]. Moscow, Azbukovnik Publ., 2021, pp. 244–253. (In Russ.)
39. Krysko, V.B. Morfologicheskie osobennosti zhitijnoj chasti Sofijskogo prologa [Morphological Features in the Sofia’s Prologue’s Hagiographies]. Slavyano-russkij prolog po drevnejshim spiskam. Sinaksar (zhitijnaya chast Prologa kratkoj redakcii) za sentyabr-fevral. Tom II: Ukazateli. Issledovaniya [Slavic-Russian Prologue According to the Most Ancient Lists. Synaxarion (Hagiographic Part of the Prologue of the Short Edition) for September-February]. Vol. II: Index. Researches. Moscow, Azbukovnik Publ., 2011, pp. 798–837. (In Russ.)
40. Skachedubova, M. V. Plyuskvamperfekt v Ipat'evskoj letopisi [Pluperfect in Hypatian Chronicle]. Tipologiya morfosintaksicheskih parametrov. Materialy mezhdunarodnoj konferencii “Tipologiya morfosintaksicheskih parametrov 2016ˮ [Typology of the Morphosyntactic Parameters. Materials of the International Conference “Typology of the Morphosyntactic Parameters 2016”]. No. 3. Moscow, MPGU Publ., 2016, pp. 280–289. (In Russ.)
41. Ronjko, R., Volf, E., Grebyonkina, M., Ershova M., Okhapkina, A., Khadasevich, A., Morozova, V. Corpus of Opochetsky dialects 2019, Moscow, Linguistic Convergence Laboratory, HSE University; V.V. Vinogradov Russian Language Institute Russian Academy of Science (Available online at URL: https://lingconlab.ru/opochka,  accessed on 27.02.2022).