[1]
M. Fikáček, F. Hebauer, and M. Hansen, “Taxonomic revision of New World species of the genus Oosternum Sharp (Coleoptera: Hydrophilidae: Sphaeridiinae) I. Definition of species groups and revision of the Oosternum aequinoctiale group”, Zootaxa, vol. 2054, no. 1, pp. 1–37, Mar. 2009.