1.
Bondarenko VV, Bondarenko VM, Pereguda YN. Local deformations of positive-definite quadratic forms. Ukr. Mat. Zhurn. [Internet]. 2012Jul.25 [cited 2024Nov.23];64(7):892-07. Available from: https://umj.imath.kiev.ua/index.php/umj/article/view/2626