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References:
[1] Hanani H.: On quadruple systems. Canad. J. Math. 12 (1960), 145-157. MR 0111696 | Zbl 0092.01202
[2] David H. A., Wolock F. W.: Cyclic designs. Annals Math. Statist. 36 (1965), 1526 až 1534. MR 0181577 | Zbl 0134.36604
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