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"Qualitative Independence and Sperner Problems for Directed Graphs."
Luisa Gargano, János Körner, Ugo Vaccaro (1992)
- Luisa Gargano, János Körner, Ugo Vaccaro:
Qualitative Independence and Sperner Problems for Directed Graphs. J. Comb. Theory A 61(2): 173-192 (1992)
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