@article{anovelclusterinternalevaluationindex,
  title = {A novel cluster internal evaluation index based on hyper-balls},
  author = {Jiang Xie and Pengfei Zhao and Shuyin Xia and Guoyin Wang and Dongdong Cheng},
  year = {2022},
  eprint = {2212.14524},
  archivePrefix = {arXiv},
  url = {https://arxiv.org/abs/2212.14524v1},
}