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Ira M. Gessel. Counting acyclic digraphs by sources and sinks. Discrete Mathematics, 160(1-3):253-258, 1996. [doi]
Possibly Related PublicationsThe following publications are possibly variants of this publication: Counting acyclic and strong digraphs by descentsKassie Archer, Ira M. Gessel, Christina Graves, Xuming Liang. DM, 343(11):112041, 2020. [doi]
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