Existence of a solution to the Dirichlet problem associated to a second-order differential equation with singularities: the method of lower and upper functions

HAKL, Robert, ZAMORA, M. Existence of a solution to the Dirichlet problem associated to a second-order differential equation with singularities: the method of lower and upper functions. Georgian Mathematical Journal. 2013, 20(3), 469-491. ISSN 1072-947X. E-ISSN 1572-9176. Dostupné z: doi: 10.1515/gmj-2013-0030.