5Taylor L R. Aggregation, variance and the mean[J]. Nature, 1961,189 : 732-735.
6Iwao S,Kuno E. An approach to the analysis of aggre- gation pattern in biological populations[C] // Patil G P,Pielou E C, Waters W E. Statistical Ecology. Penn sylvania :The Pennsylvania State UniversityPress, 1971,1:461-513.
7Waters W E. A quantitative measure of aggregation ininsects [J]. Journal o{ Economic Entomology, 1959, 52=1180 1184.
8Bliss C I, Owen A R G. Negative binomial distribu- tions with a common K[J]. Biometrika, 1958,45 : 37- 58.
9Gerrard D J, H C Chiang. Density estimation of corn rootworm egg populations based upon frequency of occurrence[J]. Ecology, 1970,51(2) : 237-245.
