@article{GDZPPN002350157, title = {On Group and Nongroup Perfect Codes in q Symbols.}, journal = {Mathematica Scandinavica}, volume = {24}, year = {1969}, pages = {149-158}, zbl = {0205.46903}, url = {http://dml.mathdoc.fr/item/GDZPPN002350157} }
Lindström, Bernt. On Group and Nongroup Perfect Codes in q Symbols.. Mathematica Scandinavica, Tome 24 (1969) pp. 149-158. http://gdmltest.u-ga.fr/item/GDZPPN002350157/