Zulkifli, M. Y., I., I., S. W., N., M. A. A., R., K., K., H., A., & Z., I. (2012). A novel multi-state particle swarm optimization for discrete combinatorial optimization problems.

Zulkifli, Md. Yusof, Ibrahim I., Nawawi S. W., Rahim M. A. A., Khalil K., Ahmad H., and Ibrahim Z. A Novel Multi-state Particle Swarm Optimization for Discrete Combinatorial Optimization Problems. 2012.

Zulkifli, Md. Yusof, et al. A Novel Multi-state Particle Swarm Optimization for Discrete Combinatorial Optimization Problems. 2012.