Cung, The Anh, and Van Hung Nguen. 2009. “Asymptotic Expansions of Solutions of the First Initial Boundary-Value Problem for Schrödinger Systems in Domains With Conical Points. II”. Ukrains’kyi Matematychnyi Zhurnal 61 (12), 1640-59. https://umj.imath.kiev.ua/index.php/umj/article/view/3128.