Мусатаева, А, and Н Мырзакулов. 2022. “The First and Second Fundamental Forms for the Camassa-Holm Equation”. BULLETIN OF THE L.N. GUMILYOV EURASIAN NATIONAL UNIVERSITY. PHYSICS. ASTRONOMY SERIES 129 (4):65-72. https://doi.org/10.32523/2616-6836-2019-129-4-65-72.