Lusternik–schnirelman theory for the action integral of the Lorentz force equation Arcoya Álvarez, David Bereanu, Cristian Torres, Pedro J. 2025-01-17T07:29:09Z 2025-01-17T07:29:09Z 2020 journal article https://hdl.handle.net/10481/99455 https://doi.org/10.1007/s00526-020-1711-0 eng http://creativecommons.org/licenses/by-nc-nd/4.0/ open access Attribution-NonCommercial-NoDerivatives 4.0 Internacional