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Murach A, Chepurukhina I. Elliptic problems with nonclassical coundary conditions in an extended Sobolev scale . Dopov. Nac. akad. nauk Ukr. [Internet]. 2020 Aug. 28 [cited 2026 Jun. 19];(8):3-10. Available from: https://nasu-periodicals.org.ua/index.php/dp/article/view/2020-8-1