@article{CMH_1949__22_138953,
     author = {L. Cesari},
     title = {Propriet\`a tangenziali delle superficie continue.},
     journal = {Commentarii mathematici Helvetici},
     pages = {1--16},
     publisher = {mathdoc},
     volume = {22},
     year = {1949},
     zbl = {0031.01501},
     url = {http://geodesic.mathdoc.fr/item/CMH_1949__22_138953/}
}