DARBINYAN, S. K. . On pre-Hamiltonian Cycles in Hamiltonian Digraphs. Mathematical Problems of Computer Science, [S. l.], v. 43, p. 5–25, 2021. Disponível em: http://www.mpcs.sci.am/index.php/mpcs/article/view/203. Acesso em: 17 jun. 2025.