S.  Nokkala, Grozeva, S., Kuznetsova, V. G., and Maryañska-Nadachowska, A., ?The origin of the achiasmatic XY sex chromosome system in Cacopsylla peregrina (Frst.) (Psylloidea, Homoptera)?, Genetica, vol. 119, pp. 327?332, 2003.

D.  Burckhardt and Lauterer, P., ?Systematics and biology of the Rhinocolinae (Homoptera: Psylloidea)?, Journal of Natural History, vol. 23, pp. 643?712, 1989.