Karatopraklieva, Maria. “A Nonlocal Boundary Value Problem for a Class of Nonlinear Equations of Mixed Type”. Ann. Sofia Univ. Fac. Math. and Inf. 98 (December 12, 2008): 143–155. Accessed December 4, 2024. https://ftl5.uni-sofia.bg/index.php/fmi/article/view/134.