de Freitas, A. 1966 O comportamento bio-ecologico da cochonilha-de-Sao-Jose Quadraspidiotus perniciosus (Comst.)] em Portugal continental. [The bio-ecological behavior of the San José scale Quadraspidiotus perniciosus (Comst.) on continental Portugal.]. Agronomia Lusitana 26(4): 289-335.

Notes: Biological and ecological studies in several localities.