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.  Jerini?-Prodanovi? and Spasic, R., ?Bactericera tremblayi Wagner (Homoptera, Triozidae) A new pest of some vegetable crops in Serbia?, University of forestry, pp. 142? 146, 2003.