@article{natureinspiredoptimizationalgorithms,
  title = {Nature-Inspired Optimization Algorithms: Challenges and Open Problems},
  author = {Xin-She Yang},
  year = {2020},
  eprint = {2003.03776},
  archivePrefix = {arXiv},
  url = {https://arxiv.org/abs/2003.03776v1},
}