HACIOGLU, ILHAN; DA FONSECA, CARLOS M. NONEXISTENCE OF SQUARE ROOTS OF DIRECTED STRONGLY REGULAR GRAPHS. Utilitas Mathematica , [S. l.], v. 116, 2020. Disponível em: https://utilitasmathematica.com/index.php/Index/article/view/1476. Acesso em: 7 may. 2026.