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@article{MZ_1989__202_1_174108, author = {Irene Zimmermann}, title = {Submodular {Subgroups} in {Finite} {Groups.}}, journal = {Mathematische Zeitschrift}, pages = {545--558}, publisher = {mathdoc}, volume = {202}, number = {1}, year = {1989}, zbl = {0704.20018}, url = {http://geodesic.mathdoc.fr/item/MZ_1989__202_1_174108/} }
Irene Zimmermann. Submodular Subgroups in Finite Groups.. Mathematische Zeitschrift, Tome 202 (1989) no. 1, pp. 545-558. http://geodesic.mathdoc.fr/item/MZ_1989__202_1_174108/