The existence of solutions for some new boundary value problems involving the q-derivative operator in quasi-b-metric and b-metric-like spaces. Letters in Nonlinear Analysis and its Applications, [S. l.], v. 2, n. 1, p. 16–22, 2024. Disponível em: https://lettersinnonlinearanalysis.com/index.php/lnaa/article/view/v2n1a03. Acesso em: 24 may. 2026.