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"Two Rings Connected with the Inclusion-Exclusion Principle."
Ottavio M. D'Antona, Gian-Carlo Rota (1978)
- Ottavio M. D'Antona, Gian-Carlo Rota:
Two Rings Connected with the Inclusion-Exclusion Principle. J. Comb. Theory A 24(3): 395-402 (1978)
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