Davies, R.G., & Boratyński, K.L. 1979 Character selection in relation to the numerical taxonomy of some male Diaspididae (Homoptera: Coccoidea).. Biological Journal of the Linnean Society 12: 95-165.

Notes: Quantitative comparison of the classifications of 24 spp. in 18 gen.; multivariate analysis; principal components & coordinates; taxonomic character weighting.