Wei, N.-C. ., T.-J. . Liao, I.-M. . Chao, P. . Wu, and Y.-C. . Chang. “An Electromagnetism-Like Mechanism Method for Solving Dynamic Cell Formation Problems”. Journal of Asian Scientific Research, vol. 3, no. 10, Oct. 2013, pp. 1022-35, https://archive.aessweb.com/index.php/5003/article/view/3553.