Vivallo, F. “The Species of the Bee Genus Centris of the ‘hyptidis group’ Revisited With the Description of Centris (Anisoctenodes) New Subgenus (Hymenoptera: Apidae: Centridini)”. European Journal of Taxonomy, no. 709, Aug. 2020, doi:10.5852/ejt.2020.709.