@article{MAN_1971__194_162190,
     author = {L. GERRITZEN},
     title = {On {Multiplication} {Algebras} of {Riemann} {Matrices.}},
     journal = {Mathematische Annalen},
     pages = {109--122},
     publisher = {mathdoc},
     volume = {194},
     year = {1971},
     zbl = {0245.14016},
     url = {http://geodesic.mathdoc.fr/item/MAN_1971__194_162190/}
}