Gubbiotti, Giorgio, Decio Levi, and Christian Scimiterna. “ON PARTIAL DIFFERENTIAL AND DIFFERENCE EQUATIONS WITH SYMMETRIES DEPENDING ON ARBITRARY FUNCTIONS”. Acta Polytechnica 56, no. 3 (June 30, 2016): 193–201. Accessed May 2, 2024. https://ojs.cvut.cz/ojs/index.php/ap/article/view/3411.