References by Billen, J. P. J.
Billen, J. P. J.; Kerkhofs, H. L. P. 1985. Ultrastructure of the ovarioles in Formica ants (Hymenoptera, Formicidae). Mitteilungen der Deutschen Gesellschaft für Allgemeine und Angewandte Entomologie 4:332-334.
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. 1989. Morphology of the cloacal gland in the ant Cataglyphis savignyi. Actes des Colloques Insectes Sociaux 5:301-306. PDF
Taxa originally described by author (including combinations)

Found no taxa described by this author.

Statistics
Published between 1982–2020
Taxon descriptions between
No. of references 112
No. of described taxa (including combinations)
No. of described taxa (valid, including combinations)
No. of described taxa (protonyms only)
Names belonging to author
Author name No. of references
Billen, J. P. J. 91
Billen, J. 21