Akbari, S., M. Kano, and S. Zare. “0-Sum and 1-Sum Flows in Regular Graphs”. The Electronic Journal of Combinatorics 23, no. 2 (May 27, 2016): P2.37. Accessed March 14, 2026. https://www.combinatorics.org/ojs/index.php/eljc/article/view/v23i2p37.