@article{JRAM_1977__290_151847,
     author = {Richard Gabriel},
     title = {Drei-Nachrichten-Probleme in verallgemeinerter {Definition.}},
     journal = {Journal f\"ur die reine und angewandte Mathematik},
     pages = {199--202},
     publisher = {mathdoc},
     volume = {290},
     year = {1977},
     zbl = {0358.15020},
     url = {http://geodesic.mathdoc.fr/item/JRAM_1977__290_151847/}
}