[1]
T. Vdovenko and M. E. Dudkin, “On nonsymmetric rank one singular perturbations of selfadjoint operators”, MFAT, vol. 22, no. 2, pp. 137–151, Jun. 2016, Accessed: Feb. 04, 2026. [Online]. Available: https://zen.imath.kiev.ua/index.php/mfat/article/view/632