Yehorchenko, I., & Vorobyova, A. (2022). Conditional and Hidden Infinite-Dimensional Symmetries of Wave Equations. Ukrainian Mathematical Journal, 74 (3), 378–384. https://doi.org/10.1007/s11253-022-02069-3


https://www.webofscience.com/wos/woscc/full-record/WOS:000875801800005  
https://link.springer.com/article/10.1007/s11253-022-02069-3