@article{CMH_1952__26_139051,
     author = {M. Pinl},
     title = {Isotrope {Vektoren} im erweiterten {Hermiteschen} {Raum.}},
     journal = {Commentarii mathematici Helvetici},
     pages = {323--327},
     publisher = {mathdoc},
     volume = {26},
     year = {1952},
     zbl = {0047.40102},
     url = {http://geodesic.mathdoc.fr/item/CMH_1952__26_139051/}
}