@article{Chen:2024Yt,
  author = "Chen, Hao  and  Qi, Hong-Rong",
  title = "{The Pole Counting Rule and X, Y, Z States}",
  doi = "10.22323/1.413.0056",
  journal = "PoS",
  year = 2024,
  volume = "CD2021",
  pages = "056"
}