On the minimal action function of autonomous lagrangians associated to magnetic fields
Annales de l'I.H.P. Analyse non linéaire, Volume 16 (1999) no. 6, p. 667-690 
@article{AIHPC_1999__16_6_667_0,
     author = {Dias Carneiro, M. J. and Lopes, Arthur},
     title = {On the minimal action function of autonomous lagrangians associated to magnetic fields},
     journal = {Annales de l'I.H.P. Analyse non lin\'eaire},
     publisher = {Gauthier-Villars},
     volume = {16},
     number = {6},
     year = {1999},
     pages = {667-690},
     zbl = {0949.37033},
     mrnumber = {1720511},
     language = {en},
     url = {http://www.numdam.org/item/AIHPC_1999__16_6_667_0}
}

Dias Carneiro, M. J.; Lopes, Arthur. On the minimal action function of autonomous lagrangians associated to magnetic fields. Annales de l'I.H.P. Analyse non linéaire, Volume 16 (1999) no. 6, pp. 667-690. http://www.numdam.org/item/AIHPC_1999__16_6_667_0/

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