Rasulov T, Khudayarov S. ON THE SPECTRUM OF A FIRST SCHUR COMPLEMENT RELATED WITH A 3X3 OPERATOR MATRIX. JGRMA [Internet]. 2019 Oct. 16 [cited 2025 Mar. 14];6(10):13-6. Available from: https://jgrma.com/index.php/jgrma/article/view/550