Chiu, C.-C., and Y.-S. Yeh. “Optimal K-Node Set Reliability With Capacity Constraint of Distributed Systems, Via a Heuristic Algorithm”. Malaysian Journal of Computer Science, vol. 15, no. 1, June 2002, pp. 45-56, https://malindojournal.um.edu.my/index.php/MJCS/article/view/6044.