@misc{indiciaeb72dad11382b,
  title = {Serum markers of bone metabolism show bone loss in hibernating bears},
  author = {S.W. Donahue and M.R. Vaughan and L.M. Demers and H.J. Donahue},
  year = {2003},
  url = {https://pubs.usgs.gov/publication/70025991},
  note = {Source identifier: 70025991}
}