ChuikoS. M. “Weakly Nonlinear Boundary-Value Problem in a Special Critical Case”. Ukrains’kyi Matematychnyi Zhurnal 61, no. 4 (April 25, 2009): 548-562. Accessed November 23, 2024. https://umj.imath.kiev.ua/index.php/umj/article/view/3039.