1.
Bondarenko VV, Bondarenko VM, Pereguda YN. Local deformations of positive-definite quadratic forms. Ukr. Mat. Zhurn. [Internet]. 2012 Jul. 25 [cited 2025 Dec. 6];64(7):892-907. Available from: https://umj.imath.kiev.ua/index.php/umj/article/view/2626