@ARTICLE{Oka03,
  author = {Okamura, H and Kitakado, T and Hiramatsu, K. and Mori, M.},
  title = {Abundance estimation of diving animals by the double-platform line
	transect method},
  journal = {Biometrics},
  year = {2003},
  volume = {59},
  pages = {512--520},
  file = {:Okamuraetal2003.pdf:PDF},
  subdatabase = {distance}
}