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@article{10_4064_cm_38_1_53_64, author = {J. P{\l}onka}, title = {On discrete subspaces of a {Hilbert} space}, journal = {Colloquium Mathematicum}, pages = {53--54}, publisher = {mathdoc}, volume = {38}, number = {1}, year = {1977}, doi = {10.4064/cm-38-1-53-64}, language = {en}, url = {http://geodesic.mathdoc.fr/articles/10.4064/cm-38-1-53-64/} }
J. Płonka. On discrete subspaces of a Hilbert space. Colloquium Mathematicum, Tome 38 (1977) no. 1, pp. 53-54. doi : 10.4064/cm-38-1-53-64. http://geodesic.mathdoc.fr/articles/10.4064/cm-38-1-53-64/
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