Burtnyak I, Chernega I, Hladkyi V, Labachuk O, Novosad Z. Application of symmetric analytic functions to spectra of linear operators. Carpathian Math. Publ. [Internet]. 2021Dec.11 [cited 2023Jun.8];13(3):701-10. Available from: https://journals.pnu.edu.ua/index.php/cmp/article/view/5563