@article{JRAM_1972__256_151246,
     author = {Ursula M\"uller},
     title = {Einer {Engelbedingung} gen\"ugende {Ringe.}},
     journal = {Journal f\"ur die reine und angewandte Mathematik},
     pages = {1--24},
     publisher = {mathdoc},
     volume = {256},
     year = {1972},
     zbl = {0241.16013},
     url = {http://geodesic.mathdoc.fr/item/JRAM_1972__256_151246/}
}