Scott, J. M., F. L. Ramsey, M. Lammertink, K. V. Rosenberg, R. Rohrbaugh, J. A. Wiens, and J. M. Reed. 2008. When is an “extinct” species really extinct? Gauging the search efforts for Hawaiian forest birds and the Ivory-billed Woodpecker. Avian Conservation and Ecology - Écologie et conservation des oiseaux 3#2): 3. [online] URL: http://www.ace-eco.org/vol3/iss2/art3/