Shea Khairalla Al’Dzhabri, K. 2018. On The Enumeration of The Transitive and Acyclic Digraphs Having a Fixed Support Set. Journal of Al-Qadisiyah for Computer Science and Mathematics. 10, 1 (Jan. 2018), Math Page 15 – 25. DOI:https://doi.org/10.29304/jqcm.2018.10.1.336.