@article{MAN_1980__252_163450,
     author = {Hans Maa{\ss}},
     title = {Harmonische {Formen} in einer {Matrixvariablen.}},
     journal = {Mathematische Annalen},
     pages = {133--140},
     publisher = {mathdoc},
     volume = {252},
     year = {1980},
     zbl = {0427.31006},
     url = {http://geodesic.mathdoc.fr/item/MAN_1980__252_163450/}
}