Kanguzhin, B.E., M.O. Mustafina, and O.A. Kaiyrbek. 2025. “Well-Posed Problems for the Laplace-Beltrami Operator on a Stratified Set Consisting of Punctured Circles and Segments”. Bulletin of the Karaganda University. Mathematics Series 119 (3):150-63. https://doi.org/10.31489/2025m3/150-163.