Non-conservative variational approximation for nonlinear Schrödinger equations J. Rossi, R. Carretero-González and P. G. Kevrekidis Eur. Phys. J. Plus, 135 10 (2020) 854 Published online: 21 October 2020 DOI: 10.1140/epjp/s13360-020-00689-x