1. Fraenkel G 1959 The Raison D’être Of Secondary Plant Substances. Science 129: 1466–1470
2. Ehrlich PR, PH Raven 1965 Butterflies And Plants: A Study In Co-Evolution. Evolution 18: 586–608
3. Kogan M, J Paxton 1983 Natural Inducers Of Plant Resistance To Insects. In PA Hedin, Ed, Plant Resistance To Insects, American Chemical Society, Washington, DC pp 153–171
4. Tingey WM, SR Singh 1980 Environmental Factors Influencing The Magnitude And Expression Of Resistance. In Fg Maxwell, Pr Jennings, Eds, Breeding Plants Resistant To Insects, John Wiley & Sons, New York Pp 89–113
5. White TCR 1974 A Hypothesis To Explain Outbreaks Of Looper Caterpillars, With Special Reference To Populations Of Selidosema Suavis In A Plantation Of Pinus Radiata In New Zealand. Oecologia 16: 279–302