Korenaga, R., Hirosaki, S., & Shiyomi, M. 1981 Models for prediction of the population density of the arrowhead scale, Unaspis yanonensis Kuwana on citrus tree, by multiple regression anaysis II.. Japanese Journal of Applied Entomology and Zoology 25: 17-25.

Notes: Multiple regression models were further improved; used 3 types of models; model C offered highest level of predicting population density.