1.
Zadorozhna NM, Ptashnik BI. Nonlocal boundary-value problem for parabolic equations with variable coefficients. Ukr. Mat. Zhurn. [Internet]. 1995 Jul. 25 [cited 2025 Dec. 5];47(7):915–921. Available from: https://umj.imath.kiev.ua/index.php/umj/article/view/5485