Archer, Kassie; Gessel, Ira M.; Graves, Christina; Liang, Xuming Counting acyclic and strong digraphs by descents. (English) Zbl 1452.05073 Discrete Math. 343, No. 11, Article ID 112041, 14 p. (2020). Reviewer: Michael Wallner (Vienna) MSC: 05C20 05C40 05C30 05A15 PDFBibTeX XMLCite \textit{K. Archer} et al., Discrete Math. 343, No. 11, Article ID 112041, 14 p. (2020; Zbl 1452.05073) Full Text: DOI arXiv
Gessel, Ira M. Counting acyclic digraphs by sources and sinks. (English) Zbl 0863.05042 Discrete Math. 160, No. 1-3, 253-258 (1996). Reviewer: P.Horák (Safat) MSC: 05C30 05C20 PDFBibTeX XMLCite \textit{I. M. Gessel}, Discrete Math. 160, No. 1--3, 253--258 (1996; Zbl 0863.05042) Full Text: DOI