BEKKAI MESSIRDI; SANAA MESSIRDI; MILOUD MESSIRDI. Drazin invertibility of sum and product of closed linear operators. Malaya Journal of Matematik, India, v. 2, n. 04, p. 472–481, 2014. DOI: 10.26637/mjm204/014. Disponível em: https://www.malayajournal.org/index.php/mjm/article/view/439. Acesso em: 16 jul. 2024.