@article{MM2_1991__70_1_155586,
     author = {Alberto Espuelas and Gabriel Navarro},
     title = {Regular {Orbits} fo {Hall} ...-subgroups.},
     journal = {Manuscripta mathematica},
     pages = {255--260},
     publisher = {mathdoc},
     volume = {70},
     number = {1},
     year = {1991},
     zbl = {0724.20010},
     url = {http://geodesic.mathdoc.fr/item/MM2_1991__70_1_155586/}
}