@article{CMH_1977__52_139706,
     author = {Walter Baur and Herbert Gross},
     title = {Strange inner product spaces.},
     journal = {Commentarii mathematici Helvetici},
     pages = {491--496},
     publisher = {mathdoc},
     volume = {52},
     year = {1977},
     zbl = {0409.46023},
     url = {http://geodesic.mathdoc.fr/item/CMH_1977__52_139706/}
}