RASULOV, Tulkin; BAHRONOV, Bekzod. DESCRIPTION OF THE NUMERICAL RANGE OF A FRIEDRICHS MODEL WITH RANK TWO PERTURBATION. Journal of Global Research in Mathematical Archives(JGRMA), [S. l.], v. 6, n. 9, p. 15–17, 2019. Disponível em: https://jgrma.com/index.php/jgrma/article/view/542. Acesso em: 14 mar. 2025.