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@article{PMF_1936_43_1_a7, author = {Hor\'ak, Z.}, title = {Sur le calcul absolu des variations}, journal = {Prace Matematyczno-Fizyczne}, pages = {119--149}, publisher = {mathdoc}, volume = {43}, number = {1}, year = {1936}, language = {fr}, url = {http://geodesic.mathdoc.fr/item/PMF_1936_43_1_a7/} }
Horák, Z. Sur le calcul absolu des variations. Prace Matematyczno-Fizyczne, Tome 43 (1936) no. 1, pp. 119-149. http://geodesic.mathdoc.fr/item/PMF_1936_43_1_a7/