[1]
V. I. Mogilevskii, “Characteristic matrices and spectral functions of first order symmetric systems with maximal deficiency index of the minimal relation”, MFAT, vol. 21, no. 1, pp. 76–98, Mar. 2015, Accessed: Dec. 16, 2025. [Online]. Available: https://zen.imath.kiev.ua/index.php/mfat/article/view/602