WANG, HAICHAO; KIM, HYE KYUNG. Signed 2-independence of Cartesian product of directed cycles and paths. Utilitas Mathematica , [S. l.], v. 90, 2013. Disponível em: https://utilitasmathematica.com/index.php/Index/article/view/980. Acesso em: 8 may. 2026.