@misc{indiciaec2a741cd8405,
  title = {Alien species in national parks: Drawing lines in space and time},
  author = {D. Houston and Edward G. Schreiner},
  year = {2002},
  doi = {10.1046/j.1523-1739.1995.09010204.x},
  url = {https://pubs.usgs.gov/publication/1015670},
  note = {Source identifier: 1015670}
}