Mukhigulashvili, S. (2015) “THE NONLOCAL BOUNDARY VALUE PROBLEMS FOR STRONGLY SINGULAR HIGHER-ORDER NONLINEAR FUNCTIONAL-DIFFERENTIAL EQUATIONS”, Italian Journal of Pure and Applied Mathematics, 35, pp. 23–50. Available at: https://journals.uniurb.it/index.php/ijpam/article/view/6459 (Accessed: 16 August 2026).