@article{QUE_1981_1981_1_a2,
     author = {Ausiello, Giorgio and Marchetti-Spaccamela, Alberto and Protasi, Marco},
     title = {Aproximabilidad completa de una clase de problemas sobre conjuntos potencias.},
     journal = {Q\"uestii\'o},
     pages = {5-11},
     publisher = {mathdoc},
     volume = {5},
     number = {1},
     year = {1981},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/QUE_1981_1981_1_a2/}
}