Cresson, Jacky, Gastão S. F. Frederico, and Delfim F. M. Torres. “Constants of Motion for Non-Differentiable Quantum Variational Problems”. Topological Methods in Nonlinear Analysis 33, no. 2 (June 1, 2009): 217–231. Accessed December 14, 2024. https://apcz.umk.pl/TMNA/article/view/TMNA.2009.015.