@article{abd2020competitive,
  title={A competitive chain-based Harris Hawks Optimizer for global optimization and multi-level image thresholding problems},
  author={Abd Elaziz, Mohamed and Heidari, Ali Asghar and Fujita, Hamido and Moayedi, Hossein},
  journal={Applied Soft Computing},
  pages={106347},
  year={2020},
  publisher={Elsevier}
}