@article{10_4153_CMB_1962_027_1,
     author = {Halperin, Israel},
     title = {On the {Gram} {Matrix}},
     journal = {Canadian mathematical bulletin},
     pages = {265--280},
     year = {1962},
     volume = {5},
     number = {3},
     doi = {10.4153/CMB-1962-027-1},
     url = {http://geodesic.mathdoc.fr/articles/10.4153/CMB-1962-027-1/}
}