@article{lei ma2024stain,
  title={Black stain and dental caries in primary dentition of preschool children in Qingdao, China},
  author={chuanyue qiao,rui han,jing yang,hao huang,lei ma},
  journal={Journal of Clinical Pediatric Dentistry},
  volume={48},
  number={4},
  pages={200--205},
  doi = {10.22514/jocpd.2024.094},
  year={2024}
}