Kozár, F., Hippe, C., & Mani, E. 1996 Morphometric analyses of the males of Quadraspidiotus species (Hom., Diaspididae) found in European orchards or their vicinity .. Journal of Applied Entomology 120: 433-437.

Notes: Morphological characteristics (antenna, scutellum) of the males of Quadraspidiotus gigas, Q. marani, Q. ostreaeformis, Q. perniciosus, Q. pyri, and Q. zonatus were analyzed; identification of distinct characters useful for differentiation of species.