@article{EXMATH_1989_1989_1_a27,
     author = {Vera L\'opez, Antonio and Ortiz de Elguea, Lourdes},
     title = {Pi-subgrupos de {Hall} y clases de conjugaci\'on},
     journal = {Extracta mathematicae},
     pages = {136-138},
     publisher = {mathdoc},
     volume = {4},
     number = {3},
     year = {1989},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/EXMATH_1989_1989_1_a27/}
}