[1]
O. Nitz, “Generalized resolvents of isometric linear relations in Pontryagin spaces, II: Krein-Langer formula”, MFAT, vol. 6, no. 3, pp. 72–96, Sep. 2000, Accessed: Dec. 17, 2025. [Online]. Available: https://zen.imath.kiev.ua/index.php/mfat/article/view/126