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@article{MS2_1969__25_166112, author = {Bernt Lindstr\"om}, title = {On {Group} and {Nongroup} {Perfect} {Codes} in q {Symbols.}}, journal = {Mathematica Scandinavica}, pages = {149--158}, publisher = {mathdoc}, volume = {25}, year = {1969}, zbl = {0205.46903}, url = {http://geodesic.mathdoc.fr/item/MS2_1969__25_166112/} }
Bernt Lindström. On Group and Nongroup Perfect Codes in q Symbols.. Mathematica Scandinavica, Tome 25 (1969), pp. 149-158. http://geodesic.mathdoc.fr/item/MS2_1969__25_166112/