Hefnawy A.I., Elsid E.A., Euat Tallah S. Cordial labeling for the sum and union of the second power of paths and stars. A Canadian journal of applied mathematics, computer science and statistics [Internet]. 2018 Sep. 9 [cited 2026 May 7];108. Available from: https://utilitasmathematica.com/index.php/Index/article/view/1294