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Nested balancedN-ary designs
Gupta, Sudhir, (1995)
Efficiency of connected binary block designs when a single observation is unavailable
Ghosh, Subir, (1992)
Divisible design graphs
Haemers, Willem H., (2010)
A class of non binary unequally replicatedE-optimal designs
Bagchi, S., (1988)