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March, 1963 On Necessary Conditions for the Existence of Some Symmetrical and Unsymmetrical Triangular PBIB Designs and BIB Designs
Esther Seiden
Ann. Math. Statist. 34(1): 348-351 (March, 1963). DOI: 10.1214/aoms/1177704279
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Vol.34 • No. 1 • March, 1963
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