RASULOV, Tulkin; KHUDAYAROV, Sanat. ON THE SPECTRUM OF A FIRST SCHUR COMPLEMENT RELATED WITH A 3X3 OPERATOR MATRIX. Journal of Global Research in Mathematical Archives(JGRMA), [S. l.], v. 6, n. 10, p. 13–16, 2019. Disponível em: https://www.jgrma.com/index.php/jgrma/article/view/550. Acesso em: 7 may. 2025.