Wysoki, M. 1987 A bibliography of the pyriform scale, Protopulvinaria pyriformis (Cockerell, 1894) (Homoptera: Coccidae), up to 1986.. Phytoparasitica 15: 73-77.
Wysoki, M. 1987 A bibliography of the pyriform scale, Protopulvinaria pyriformis (Cockerell, 1894) (Homoptera: Coccidae), up to 1986.. Phytoparasitica 15: 73-77.