@article{GDZPPN002353334, title = {A generalized Lloyd theorem and mixed perfect codes.}, journal = {Mathematica Scandinavica}, volume = {36}, year = {1975}, pages = {13-26}, zbl = {0318.94014}, url = {http://dml.mathdoc.fr/item/GDZPPN002353334} }
Heden, Olof. A generalized Lloyd theorem and mixed perfect codes.. Mathematica Scandinavica, Tome 36 (1975) pp. 13-26. http://gdmltest.u-ga.fr/item/GDZPPN002353334/