@article{GDZPPN002062623, title = {Strange inner product spaces.}, journal = {Commentarii mathematici Helvetici}, volume = {52}, year = {1977}, pages = {491-496}, zbl = {0409.46023}, url = {http://dml.mathdoc.fr/item/GDZPPN002062623} }
Baur, Walter; Gross, Herbert. Strange inner product spaces.. Commentarii mathematici Helvetici, Tome 52 (1977) pp. 491-496. http://gdmltest.u-ga.fr/item/GDZPPN002062623/