Iоkhvіdоv I. S. “Continuation of Teplitz Forms Preserving the Number of Positive Squares”. Ukrains’kyi Matematychnyi Zhurnal 18, no. 3 (April 27, 1966): 40–50. Accessed December 6, 2025. https://umj.imath.kiev.ua/index.php/umj/article/view/8735.