1.
Shabozov MS. Best approximation and best unilateral approximation of the kernel of a biharmonic equation and optimal renewal of the values of operators. Ukr. Mat. Zhurn. [Internet]. 1995Nov.25 [cited 2024May18];47(11):1549–1557. Available from: https://umj.imath.kiev.ua/index.php/umj/article/view/5546