- Systematic studies on Pseudomyrmex acacia-ants (Hymenoptera: Formicidae: Pseudomyrmicinae).
- Taxonomy, phylogeny and biogeography of the ant genus Tetraponera (Hymenoptera: Formicidae) in the Oriental and Australian regions.
- A revision of the ant genus Rhytidoponera (Hymenoptera: Formicidae) in New Caledonia.
- Mesic Elements in the Western Nearctic Ant Fauna: Taxonomic and Biological Notes on Amblyopone, Proceratium and Smithistruma (Hymenoptera: Formicidae)
- Systematic Studies on Pseudomyrmecine Ants: Revision of the Pseudomyrmex Oculatus and P. Subtilissimus Species Groups, with Taxonomic Comments on Other Species