@article{BUMI_2003_8_6B_3_a7, author = {Beidleman, James and Heineken, Hermann}, title = {Pronormal and subnormal subgroups and permutability}, journal = {Bollettino della Unione matematica italiana}, pages = {605--615}, publisher = {mathdoc}, volume = {Ser. 8, 6B}, number = {3}, year = {2003}, zbl = {1147.20301}, mrnumber = {364444}, language = {en}, url = {http://geodesic.mathdoc.fr/item/BUMI_2003_8_6B_3_a7/} }