M. Antony Arockiasamy, S. Kalaiarasi, and P. Tamizharasi. “Cordial Labeling of N-Chain Aztec Diamond Graphs”. International Journal of Mathematics And Its Applications, vol. 6, no. 1 (Special Issue), May 2018, pp. 139-46, https://ijmaa.in/index.php/ijmaa/article/view/1407.