@techreport{Zehtindjiev-2019-768103,
  author = {Zehtindjiev, P and Whitfield, D},
  title = {Monitoring of spring bird migration in the Integrated System for Protection of Birds 2019},
  institution = {Bulgarian Academy of Sciences},
  year = {2019},
  month = {oct},
  url = {https://img1.wsimg.com/blobby/go/1a109f6d-5fe3-4ff5-bcf3-17602b59ac27/downloads/2019%20Report_Spring%20Bird%20Migration_ENG.pdf?ver=1614243304798},
  keywords = {Wind Energy, Land-Based Wind, Collision, Displacement, Birds},
}