@article{CM_1954-1956__12__137_0,
     author = {Villa, Mario},
     title = {Problemi integrali sulle trasformazioni puntuali},
     journal = {Compositio Mathematica},
     pages = {137--146},
     publisher = {Kraus Reprint},
     volume = {12},
     year = {1954-1956},
     mrnumber = {70230},
     zbl = {0058.15302},
     language = {it},
     url = {http://www.numdam.org/item/CM_1954-1956__12__137_0/}
}