Storozh O. Maximal nonnegative and $\theta$-accretive extensions of a positive definite linear relation. Carpathian Math. Publ. [Internet]. 2020 Oct. 18 [cited 2024 Nov. 24];12(2):289-96. Available from: https://vps.pnu.edu.ua/index.php/cmp/article/view/3921