@article{CMH_1979__54_139782,
     author = {P. Gabriel and Ch. Riedtmann},
     title = {Group representations without groups.},
     journal = {Commentarii mathematici Helvetici},
     pages = {240--287},
     publisher = {mathdoc},
     volume = {54},
     year = {1979},
     zbl = {0447.16023},
     url = {http://geodesic.mathdoc.fr/item/CMH_1979__54_139782/}
}