@article{MS2_1989__65_2_167082,
     author = {Torben Maack Bisgaard},
     title = {Characterization of perfect involution groups.},
     journal = {Mathematica Scandinavica},
     pages = {245--258},
     publisher = {mathdoc},
     volume = {65},
     number = {2},
     year = {1989},
     zbl = {0739.43007},
     url = {http://geodesic.mathdoc.fr/item/MS2_1989__65_2_167082/}
}