Mel’nikT. A. 2000. “Homogenization of a Singularly Perturbed Parabolic Problem in a Thick Periodic Junction of the Type 3:2:1”. Ukrains’kyi Matematychnyi Zhurnal 52 (11), 1524-33. https://umj.imath.kiev.ua/index.php/umj/article/view/4558.