@article{JRAM_1969__0239_0240_150974,
     author = {J.E. Hofmann},
     title = {\"Uber {Kreisquadrupel} und heronische {Dreiecke.}},
     journal = {Journal f\"ur die reine und angewandte Mathematik},
     pages = {220--238},
     publisher = {mathdoc},
     volume = {0239_0240},
     year = {1969},
     language = {de},
     url = {http://geodesic.mathdoc.fr/item/JRAM_1969__0239_0240_150974/}
}