Esina, Anna I., and Andrei I. Shafarevich. “SEMICLASSICAL ASYMPTOTICS OF EIGENVALUES FOR NON-SELFADJOINT OPERATORS AND QUANTIZATION CONDITIONS ON RIEMANN SURFACES”. Acta Polytechnica 54, no. 2 (April 30, 2014): 101–105. Accessed May 4, 2024. https://ojs.cvut.cz/ojs/index.php/ap/article/view/2077.