Makarov VL. Sufficient conditions for the convergence of the V. A. Marchenko asymptotic series for eigenvalues of the Sturm–Liouville problem . Dopov. Nac. akad. nauk Ukr. [Internet]. 2025 Mar. 11 [cited 2026 May 10];(11):16-21. Available from: https://nasu-periodicals.org.ua/index.php/dp/article/view/16814