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On the covering of pairs by quadruples. II. (English) Zbl 0261.05022

MSC:
05B40 Combinatorial aspects of packing and covering
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[1] Bose, R.C.; Shrikhande, S.S.; Parker, E.T., Further results on the construction of mutually orthogonal Latin squares and the falsity of Euler’s conjecture, Canad. J. math., 12, 189-203, (1960) · Zbl 0093.31905
[2] Fort, M.K.; Hedlund, G.A., Minimal coverings of pairs by triples, Pacific J. math., 8, 709-719, (1958) · Zbl 0084.01401
[3] Hanani, H., The existence and construction of balanced incomplete block designs, Ann. math. statist., 32, 361-386, (1961) · Zbl 0107.36102
[4] Hanani, H., On the number of orthogonal Latin squares, J. combinatorial theory, 8, 247-271, (1970) · Zbl 0214.02902
[5] Mills, W.H., Three mutually orthogonal Latin squares, J. combinatorial theory ser. A, 13, 79-82, (1972) · Zbl 0243.05016
[6] Mills, W.H., On the covering of pairs by quadruples. I, J. combinatorial theory ser. A, 13, 55-78, (1972) · Zbl 0243.05024
[7] Ray-Chaudhuri, D.K.; Wilson, Richard M., Solution of Kirkman’s school girl problem, (), 187-203
[8] Schönheim, J., On coverings, Pacific J. math., 14, 1405-1411, (1964) · Zbl 0128.24501
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