Matveenko, Valeriy Pavlovich, Sevodin Мikhail Аlekseevich, and Natalya Vitalievna Sevodina. 2014. “Applications of Muller’s Method and the Argument Principle to Eigenvalue Problems in Solid Mechanics”. Computational Continuum Mechanics 7 (3): 331-36. https://doi.org/10.7242/1999-6691/2014.7.3.32.