Kamouche, S., H. Guebbai, M. Ghiat, and M. Kurulay. “The Kantorovich Projection Method in the Generalized Quadratic Spectrum Approximation”. Numerical Methods and Programming (Vychislitel’nye Metody I Programmirovanie), vol. 23, no. 73, Sept. 2022, pp. 240-7, doi:10.26089/NumMet.v23r315.