@article{JRAM_1969__0239_0240_150982,
     author = {Rudolf Wille},
     title = {Subdirekte {Produkte} und konjunkte {Summen.}},
     journal = {Journal f\"ur die reine und angewandte Mathematik},
     pages = {333--338},
     publisher = {mathdoc},
     volume = {0239_0240},
     year = {1969},
     zbl = {0221.08005},
     url = {http://geodesic.mathdoc.fr/item/JRAM_1969__0239_0240_150982/}
}