@article{GAMA_1973_1973_1_a10,
     author = {Machado Cardoso, Jayme},
     title = {S\^obre elipses homot\'eticas.},
     journal = {Gaceta matem\'atica},
     pages = {136-138},
     publisher = {mathdoc},
     volume = {25},
     number = {5-6},
     year = {1973},
     url = {http://geodesic.mathdoc.fr/item/GAMA_1973_1973_1_a10/}
}