Chueshov, I., & Pankratov, L. (1999). Upper semicontinuity of attractors of semilinear parabolic equations with asymptotically degenerating coefficients. Математическая физика, анализ, геометрия, 6(1-2), 158–181. вилучено із https://mag.ilt.kharkiv.ua/index.php/mag/article/view/m06-0158e