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Douwes, P. 1981b. Intraspecific and interspecific variation in workers of the Formica rufa group (Hymenoptera: Formicidae) in Sweden. Entomologica Scandinavica. Supplementum 15:213-223.
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Bergström, G. 1981. Chemical aspects of insect exocrine signals as a means for systematic and phylogenetic discussions in aculeate Hymenoptera. Entomologica Scandinavica. Supplementum 15:173-184.
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