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Billen, J. P. J. 1985a. Ultrastructure of the worker ovarioles in Formica ants (Hymenoptera: Formicidae). International Journal of Insect Morphology and Embryology 14:21-32.

Billen, J. P. J. 1985b. Comparative ultrastructure of the poison and Dufour glands in Old and New World army ants (Hymenoptera, Formicidae). Actes des Colloques Insectes Sociaux 2:17-26.

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Billen, J. P. J. 1986a. Morphology and ultrastructure of the Dufour's and venom gland in the ant, Myrmica rubra (L.) (Hymenoptera: Formicidae). International Journal of Insect Morphology and Embryology 15:13-25.

Billen, J. P. J. 1987b. New structural aspects of the Dufour's and venom glands in social insects. Naturwissenschaften 74:340-341.

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Billen, J. P. J.; Boven, J. K. A. 1983. The chemical composition of the Dufour gland contents of workers of the ant Formica cunicularia. A test for recognition of the species. Annales de la Société Royale Zoologique de Belgique 113(suppl.1):283-289.

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