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"A geometric construction of the Steiner system S(4, 7, 23)."
Alphonse Baartmans, Walter D. Wallis, Joseph L. Yucas (1992)
- Alphonse Baartmans, Walter D. Wallis, Joseph L. Yucas:
A geometric construction of the Steiner system S(4, 7, 23). Discret. Math. 102(2): 177-186 (1992)
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