Bengtsson, J. / 2000 / Biodiversity, disturbances, ecosystem function and management of European forests / For. Ecol. Manage 132:39~50 Chao, A. / 1984 / Nonparametric Estimation of the Number of Classes in a Population / Scand. J. Statist 11:265~270 Choi, S. W. / 2012 / The past and current status of endangered butterflies in Korea / Entomol. Sci 15:1~12 Colwell, R.K. / Estimate S: statistical estimation of species richness and shared species from sample. Version 7.5 User’s Guide and application Colwell, R. K. / 2004 / Interpolating, extrapolating, and comparing incidence-based species accumulation curves / Ecology 85:2717~2727