@article{MZ_1970__115_171356,
     author = {Karl-Heinz Helwig},
     title = {Jordan-Algebren und symmetrische {R\"aume.} {I.}},
     journal = {Mathematische Zeitschrift},
     pages = {315--349},
     publisher = {mathdoc},
     volume = {115},
     year = {1970},
     language = {de},
     url = {http://geodesic.mathdoc.fr/item/MZ_1970__115_171356/}
}