MUTHUGOBAL, B.K.N. ON S-K-IDEMPOTENT MATRICES. Journal of Global Research in Mathematical Archives(JGRMA), [S. l.], v. 1, n. 2, p. 71–75, 2013. Disponível em: https://jgrma.com/index.php/jgrma/article/view/9. Acesso em: 29 apr. 2025.