@techreport{Zehtindjiev-2023-2080219,
  author = {Zehtindjiev, P and Whitefield, P},
  title = {Monitoring of spring bird migration in the Integrated System for Protection of Birds 2023},
  institution = {Bulgarian Academy of Sciences},
  year = {2023},
  month = {jun},
  url = {https://img1.wsimg.com/blobby/go/1a109f6d-5fe3-4ff5-bcf3-17602b59ac27/downloads/2023%20Report_Spring%20Bird%20Migration_ENG.pdf?ver=1728455317008},
  keywords = {Wind Energy, Birds},
}