@article{MZ_1960__74_169868,
     author = {Wolfram Menzel},
     title = {\"Uber den {Untergruppenverband} einer {Abelschen} {Operatorgruppe.} {Teil} {I:} {m-Verb\"ande.}},
     journal = {Mathematische Zeitschrift},
     pages = {39--51},
     publisher = {mathdoc},
     volume = {74},
     year = {1960},
     zbl = {0098.25003},
     url = {http://geodesic.mathdoc.fr/item/MZ_1960__74_169868/}
}