Kabi-Nejad, Parastoo, and Mehdi Nadjafikhah. “Generalized Symmetries and Higher-Order Conservation Laws of the Camassa–Holm Equation: Mathematics-Physics”. International Journal of Fundamental Physical Sciences 9, no. 2 (June 30, 2019): 20-25. Accessed April 23, 2024. https://fundamentaljournals.org/index.php/ijfps/article/view/26.