A comparison of some population density sampling techniques for biodiversity, conservation, and environmental impact studies. - Bakus, Gerald J.; Nishiyama, Gregory; Hajdu, Eduardo; Mehta, Hetal; Mohammad, Mahadi; Pinheiro, Ulisses dos S.; Sohn, Stephen A.; Pham, Thaddeus K.; Yasin, Zulfigar bin; Tan Shau-Hwai; Karam, Abraham; Hanan, Erin (Biodiversity & Conservation, 2007)