@article{10_4064_fm_72_3_265_269,
     author = {Joseph Valentine},
     title = {On criteria of {Blumenthal} for inner-product spaces},
     journal = {Fundamenta Mathematicae},
     pages = {265--269},
     publisher = {mathdoc},
     volume = {72},
     number = {3},
     year = {1971},
     doi = {10.4064/fm-72-3-265-269},
     language = {en},
     url = {http://geodesic.mathdoc.fr/articles/10.4064/fm-72-3-265-269/}
}