@misc{W2108388069,
  author = {Asanga Ratnaweera and Saman Halgamuge and H. C. Watson},
  title = {Self-Organizing Hierarchical Particle Swarm Optimizer With Time-Varying Acceleration Coefficients},
  year = {2004},
  howpublished = {IEEE Transactions on Evolutionary Computation},
  doi = {https://doi.org/10.1109/tevc.2004.826071}
}