@article{PORMA_1969__28_3_115092,
     author = {D'Ambrosio, Ubiratan},
     title = {On hypersurfaces of limite type},
     journal = {Portugaliae mathematica},
     pages = {127--132},
     publisher = {mathdoc},
     volume = {28},
     number = {3},
     year = {1969},
     mrnumber = {0290218},
     zbl = {0209.36304},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/PORMA_1969__28_3_115092/}
}