1.
Ð’arkovskyVV, Roitberg YA. On the minimum and maximum operator corresponding to the general elliptical problem with inhomogeneous boundary value conditions . Ukr. Mat. Zhurn. [Internet]. 1966Mar.5 [cited 2024Nov.24];18(2):91-7. Available from: https://umj.imath.kiev.ua/index.php/umj/article/view/8719