1. J. Barlow, and S. Sexton, 1996 . The effect of diving and searching behavior on the probability of detecting track-line groups, g0, of long-diving whales during line-transect surveys . NOAA National Marine Fisheries Service, Southwest Fisheries Center Administrative Report LJ-96-14. 21 pp.
2. A. A. Berzin, and A. W. Yabiokov, 1971 . The sperm whale. Pishchevaya Promyshlenuost, Moscow . (). [Translation by Israel Programme for Scientific Translations. 394 pp].
3. A Robust Line Transect Method