@article{IM_1969__8_141977,
     author = {J. MILNOR},
     title = {On {Isometries} of {Inner} {Product} {Spaces.}},
     journal = {Inventiones mathematicae},
     pages = {83--97},
     publisher = {mathdoc},
     volume = {8},
     year = {1969},
     zbl = {0177.05204},
     url = {http://geodesic.mathdoc.fr/item/IM_1969__8_141977/}
}