Mel'nik, T. A. “Homogenization of a Singularly Perturbed Parabolic Problem in a Thick Periodic Junction of the Type 3:2:1”. Ukrains’kyi Matematychnyi Zhurnal 52, no. 11 (November 25, 2000): 1524–1533. Accessed April 11, 2025. https://umj.imath.kiev.ua/index.php/umj/article/view/4558.