Prayitno, Muhammad Irfan Arsyad, and Kiki Ariyanti Sugeng. “On Characteristic Polynomial of Antiadjacency Matrix of A Line Digraph”. Jurnal Matematika UNAND, vol. 11, no. 1, Apr. 2022, pp. 74-81, doi:10.25077/jmu.11.1.74-81.2022.