Chepurukhina IS. A semihomogeneous elliptic problem with additional unknown functions in boundary conditions . Dopov. Nac. akad. nauk Ukr. [Internet]. 2025 Feb. 5 [cited 2026 Apr. 19];(7):20-8. Available from: https://nasu-periodicals.org.ua/index.php/dp/article/view/15067