@ARTICLE{Cher98,
  author = {Cherenkov, S. E.},
  title = {Accuracy of one-visit censuses of forest passerine birds during a
	breeding season},
  journal = {Zoologichesky Zhurnal},
  year = {1998},
  volume = {77},
  pages = {474--485},
  subdatabase = {distance}
}