@misc{indiciaeb04db4ca48a5,
  title = {Crassulacean acid metabolism (CAM) in high elevation tropical cactus},
  author = {Jon E. Keeley and S.C. Keeley},
  year = {2006},
  doi = {10.1111/j.1365-3040.1989.tb01948.x},
  url = {https://pubs.usgs.gov/publication/1007483},
  note = {Source identifier: 1007483}
}