Geodesic
Group Partitions and Mixed Perfect Codes
Canadian mathematical bulletin, Tome 18 (1975) no. 1, pp. 57-60

Voir la notice de l'article provenant de la source Cambridge University Press

Let G be a finite abelian group of the order p r and type (p, ..., p), where p is a prime. A necessary and sufficient condition is determined for the existence of subgroups G1, G2, ⋯, Gn, one of the order pa and the rest of the order pb , such that G = G1 ∪ G2 ∪ ⋯ ∪ Gn and Gi, ∩ Gj,= {θ} when i ≠ j. 
Lindström, Bernt. Group Partitions and Mixed Perfect Codes. Canadian mathematical bulletin, Tome 18 (1975) no. 1, pp. 57-60. doi: 10.4153/CMB-1975-011-2
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