The spectrum of nested group divisible designs of typetn

Jinhua Wang
2006 Journal of Discrete Mathematical Sciences and Cryptography  
The obvious necessary conditions for the existence of a λ-fold nested group divisible design of type t n are λt(n − 1) ≡ 0 (mod 6) and n ≥ 4. We show that these conditions are also sufficient.
doi:10.1080/09720529.2006.10698060 fatcat:edh23wed2rdfrix7qbqjuhfip4