@misc{indiciaec87df2213ad9,
  title = {Temporal variability of local abundance, sex ratio and activity in the Sardinian chalk hill blue butterfly},
  author = {P. Casula and J.D. Nichols},
  year = {2003},
  url = {https://pubs.usgs.gov/publication/5224257},
  note = {Source identifier: 5224257}
}