Funded by the National Science Foundation PEET program (Partnerships for Enhancing Expertise in Taxonomy)
Ferreira, M. C., and G. W. S. Ferreira. 1990a. Pages 30—31, 49-75 in Pragas das resinosas: Guia de Campo. Ministerio da Agricultura, Pescas e Alimentacao, Direccao-Geral de Planeamento & Agricultura, Lisboa, Serie Divulgacao, No. 3. 108 p.