Zhang, Peng, Wenbo Zhao, and Daming Zhu. “Complexity and Approximation Results for the Min-Sum and Min-Max Disjoint Paths Problems”. COMPUTING AND INFORMATICS 32, no. 1 (March 22, 2013): 23–45. Accessed April 25, 2024. https://www.cai.sk/ojs/index.php/cai/article/view/1465.