Storozh O. On an approach to the construction of the Friedrichs and Neumann-Krein extensions of nonnegative linear relations. Carpathian Math. Publ. [Internet]. 2018 Dec. 31 [cited 2024 Apr. 19];10(2):387-94. Available from: https://journals.pnu.edu.ua/index.php/cmp/article/view/1498