Baker 1999. On new stelidine bees from S.W. Asia and N.W. Africa, with a list of the Old-World taxa assigned to the genus Stelis Panzer, 1806 (Hymenoptera, Apoidea, Megachilidae). Mitteilungen aus dem Museum fuer Naturkunde in Berlin Deutsche Entomologische Zeitschrift, 46(2) 1999: 231-242