Summary
Two-associate class PBIB designs, having association schemes of GD orL 2 types, are constructed by using patterned matrices and by methods of taking unions of sets of blocks.
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References
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Banerjee, S., Kageyama, S. & Bhagwandas Some constructions of two-associate class PBIB designs. Ann Inst Stat Math 39, 671–679 (1987). https://doi.org/10.1007/BF02491499
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DOI: https://doi.org/10.1007/BF02491499