Akbari, Saieed, Farhad Rahmati, and Sanaz Zare. “Zero-Sum Magic Labelings and Null Sets of Regular Graphs”. The Electronic Journal of Combinatorics 21, no. 2 (May 2, 2014): #P2.17. Accessed April 14, 2026. https://www.combinatorics.org/ojs/index.php/eljc/article/view/v21i2p17.