Kanguzhin, B.E., Mustafina, M.O., & Kaiyrbek, O.A. (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, 3(119), 150–163. https://doi.org/10.31489/2025m3/150-163