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@article{MZ_1977__157_172591, author = {Dietrich Bartels}, title = {Subnormality and {Invariant} {Relations} on {Conjugacy} {Classes} in {Finite} {Groups.}}, journal = {Mathematische Zeitschrift}, pages = {13--18}, publisher = {mathdoc}, volume = {157}, year = {1977}, zbl = {0348.20019}, url = {http://geodesic.mathdoc.fr/item/MZ_1977__157_172591/} }
Dietrich Bartels. Subnormality and Invariant Relations on Conjugacy Classes in Finite Groups.. Mathematische Zeitschrift, Tome 157 (1977), pp. 13-18. http://geodesic.mathdoc.fr/item/MZ_1977__157_172591/