@article{10_4064_sm_8_1_68_77,
     author = {P. Gillis},
     title = {Sur les probl\`emes r\'eguliers du calcul des variations de la forme $I[},
     journal = {Studia Mathematica},
     pages = {68--77},
     publisher = {mathdoc},
     volume = {8},
     number = {1},
     year = {1939},
     doi = {10.4064/sm-8-1-68-77},
     language = {fr},
     url = {http://geodesic.mathdoc.fr/articles/10.4064/sm-8-1-68-77/}
}