MUKHIGULASHVILI, Sulkhan. THE NONLOCAL BOUNDARY VALUE PROBLEMS FOR STRONGLY SINGULAR HIGHER-ORDER NONLINEAR FUNCTIONAL-DIFFERENTIAL EQUATIONS. Italian Journal of Pure and Applied Mathematics, [S. l.], v. 35, p. 23–50, 2015. Disponível em: https://journals.uniurb.it/index.php/ijpam/article/view/6459. Acesso em: 16 aug. 2026.