@article{GAMA_1978_1978_1_a1,
     author = {Machado Cardoso, Jayme},
     title = {Sistemas de proje\c{c}ao nao m\'etricos.},
     journal = {Gaceta matem\'atica},
     pages = {18-21},
     publisher = {mathdoc},
     volume = {30},
     number = {1-2},
     year = {1978},
     url = {http://geodesic.mathdoc.fr/item/GAMA_1978_1978_1_a1/}
}