Funded by the National Science Foundation PEET program (Partnerships for Enhancing Expertise in Taxonomy)
Vitola, R., and G. Ozols. 1989. Problems of the protection of pine and spruce from harmful insects and diseases in the Latvian SSR. (In Russian). Pages 4-11 In Z.P. Spalvin'sh (ed), Zashchita sosny i eli v Latviiskoi SSR. Riga: USSR.