Darbinyan, Samvel Kh., and Iskandar A. Karapetyan. “On Cycles Through Vertices of Large Semidegree in Digraphs”. Mathematical Problems of Computer Science 39 (December 10, 2021): 106–118. Accessed May 6, 2024. http://mpcs.sci.am/index.php/mpcs/article/view/428.