@article{COMIM_2012__20_2_a3,
     author = {L\'opez, Emanuel and Molgado, Alberto and Vallejo, Jos\'e A.},
     title = {The principle of stationary action in the calculus of variations},
     journal = {Communications in Mathematics},
     pages = {89--116},
     publisher = {mathdoc},
     volume = {20},
     number = {2},
     year = {2012},
     mrnumber = {3032807},
     zbl = {06165038},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/COMIM_2012__20_2_a3/}
}