Search publications of the members of the Royal Belgian institute of natural Sciences
- Carabidae (Coleoptera) collected with pitfall traps in different habitats at Ferrières and Xhoris (Belgium).
- Faune aranéologique du 'Site de Corphalie' (Antheit, Prov. Liège)
- De spinnen (Araneae) van appel- en perenboomgaarden.
- Spinnen van de Latemse Meersen: soortensamenstelling in functie van het grondgebruik.
- Les abeilles des Graminées ou Lipotriches Gerstaecker, 1858 sensu stricto (hymen optera: Apoidea: Halictidae: Nomiinae) de la Région Orientale
- Les Abeilles des Graminées ou Lipotriches Gerstaecker, 1858 sensu stricto (Hymenoptera: Apidea: Halictidae: Nomiinae) et l'Afrique subsaharienne.
- Capalictus, a new subgenus of Lasioglossum Curtis, 1833 froum South Africa, with description of three new species (Hymenoptera, Apoidea, Halictidae).
- Three new species of Eupetersia Blüthgen, 1928 (Hymenoptera Halictidae) from the Oriental Region.
- A new species of the palaearctic genus Dasypoda Latreille 1802 (Hymenoptera: Dasypodaidae) from the Great Rift Valley in Ethiopia.
- Description of Lasioglossum (Medioceralictus) orchidodecptum sp.n. from Thailand and India (Hymenoptera: Halictidae)
- The Bee Benera and Subgenera of sub-Saharan Africa
- New Afrotropical species of the bee subgenus Patellapis (Chaetalictus) with notes on additional species (Hymenotera: Halictidae)
- Hyménoptères Apoidea (Insecta) de l'archipel du Vanuatu.
- Classification des Nomiinae de la Région Orientale, de Nouvelole-Guinée et des îles de l'Océan Pacifique (Hymenoptera: Apoidea: Halictidae).
- Red List of the saproxylic scarab beetles (Coleoptera: Lucanidae, Cetoniidae and Dynastidae) for Flanders
- A contribution to the Fauna of Nomioidine Bees of the Arabian Peninsula (Hymenoptera: Halictidae)
- A contribution to the Fauna of Nomioidine Bees of the Arabian Peninsula (Hymenoptera: Halictidae)
- Factors limiting the species richness of bees in Saharan Africa.
- Ceylalictus variegatus (Olivier) (Hymenoptera, Halictidae) espèce nouvelle pour l'Aquitaine (France)
- Phylogeny of Halictidae with an emphasis on endemic African halictinae