RASULOV, Tulkin; TOSHEVA, Nargiza. NEW BRANCHES OF THE ESSENTIAL SPECTRUM OF A FAMILY OF 3x3 OPERATOR MATRICES. Journal of Global Research in Mathematical Archives(JGRMA), [S. l.], v. 6, n. 9, p. 18–21, 2019. Disponível em: https://jgrma.com/index.php/jgrma/article/view/543. Acesso em: 28 apr. 2025.