@misc{indiciae06b85e611940,
  title = {Vector-pseudoscalar mass splitting and Upsilon - eta b mass difference.},
  author = {X Song},
  year = {1989},
  doi = {10.1103/physrevd.40.3655},
  url = {https://pubmed.ncbi.nlm.nih.gov/10011744/},
  note = {Source identifier: 10011744}
}