@article{Spasov-2012-3978,
  author = {Spasov, S and Arkumarev, V and Dobrev, D and Dobrev, V},
  title = {An Overview of Monitoring for Raptors in Bulgaria},
  journal = {Acrocephalus},
  year = {2012},
  month = {dec},
  volume = {33},
  pages = {181--189},
  url = {http://www.eurapmon.net/sites/default/files/eurapmon_acrocephalus_008_bulgaria.pdf},
  keywords = {Wind Energy, Land-Based Wind, Displacement, Collision, Birds},
}