1.
Langer H, Langer M, Sasvári Z. Continuations of Hermitian indefinite functions and corresponding canonical systems: an example. MFAT [Internet]. 2004 Mar. 25 [cited 2026 Feb. 4];10(1):39-53. Available from: https://zen.imath.kiev.ua/index.php/mfat/article/view/230