A supplement to Parker's ``Remarks on balanced incomplete block designs''
-  R. C. Bose and K. A. Bush, Orthogonal arrays of strength two and three, Ann. Math. Statistics 23 (1952), 508–524. MR 51204, https://doi.org/10.1214/aoms/1177729331
-  E. T. Parker, Remarks on balanced incomplete block designs, Proc. Amer. Math. Soc. 14 (1963), 729–730. MR 154822, https://doi.org/10.1090/S0002-9939-1963-0154822-2
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