@article{MAN_1929__101_159360,
     author = {T. Rad\'o},
     title = {\"Uber zweidimensionale regul\"are {Variationsprobleme} der {Form} ... .... {F} (p,q) dxdy = {Minimum}},
     journal = {Mathematische Annalen},
     pages = {620--632},
     year = {1929},
     volume = {101},
     url = {http://geodesic.mathdoc.fr/item/MAN_1929__101_159360/}
}