@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/