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- Proposition De Clé D'identification Des Eucerini
- Scientific Papers
- Hymenoptera, Apoidea) for Sardinia (Italy)
- Bees of the Socotra Archipelago (Hymenoptera: Anthophila), Their Biogeography and Association with Parasites
- The Wild Bees (Hymenoptera: Apoidea) of Morocco
- Catalog of Hymenoptera Described by Giovanni Gribodo (1846–1924) (Insecta)
- Document: Free, J
- Ulugombakia, a New Eucerine Bee from Malaya
- Enhancement of the Diversity of Pollinators and Beneficial Insects in Intensively Managed Vineyards
- (Hymenoptera: Apidae) in the Pollination and the Yields of Abelmoschus Esculentus in Maroua, Cameroon
- Phylogeny, New Generic-Level Classification, And
- Insect Pollinators Within Cotton Fields of Small-Scale Farms in Mwachisompola, Zambia and Development of an Educational Manual
- Taxonomic and Phylogenetic Problems in Old World Eucerine Bees, with Special Reference to the Genus Tarsalia Morawitz, 1895 (Hymenoptera: Apoidea: Anthophoridae)
- Floral Visits of the Wild Bee, Lithurgus Atratus, Impact Yield and Seed Germinability of Okra, Abelmoschus Esculentus, in Sri Lanka
- In Sri Lanka with Financial Assistance from the Royal Netherlands Government