Skarżyński, D.; Babenko, A. Description of Two New Species of <i>Hypogastrura</i> Bourlet, 1839 of the <i>H. crassaegranulata</i> Group (Collembola: Hypogastruridae) from the Caucasus, With Notes on Some Related Species. Entomol. Fennica 2009, 20, 275-280.