@article{MM2_1969__1_153977,
     author = {Karl-Heinz Helwig},
     title = {Involutionen von {Jordan-Algebren.}},
     journal = {Manuscripta mathematica},
     pages = {211--230},
     publisher = {mathdoc},
     volume = {1},
     year = {1969},
     language = {de},
     url = {http://geodesic.mathdoc.fr/item/MM2_1969__1_153977/}
}