The Number of Dependent Arcs in an Acyclic Orientation . Fisher, D. C., Fraughnaugh, K., Langley, L., & West, D. B. Journal of Combinatorial Theory, Series B , 71(1):73 - 78, 1997.
bibtex   
@article{Fisher199773,
title = "The Number of Dependent Arcs in an Acyclic Orientation ",
journal = "Journal of Combinatorial Theory, Series B ",
volume = "71",
number = "1",
pages = "73 - 78",
year = "1997",
note = "",
issn = "0095-8956",
author = "David C. Fisher and Kathryn Fraughnaugh and Larry Langley and Douglas B. West"
}

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