A.L. Chepalyga, Kh.A. Amirkhanov, V.M. Trubikhin, T.A. Sadchikova, A.N. Pirogov e A.I. Taimazov, Geoarchaeology of the earliest paleolithic sites (Oldowan) in the North Caucasus and the East Europe, su paleogeo.org, 2011. URL consultato il 18 dicembre 2013 (archiviato dall'url originale il 20 maggio 2013).
«Early Paleolithic cultural layers with tools of oldowan type was discovered in East Caucasus (Dagestan, Russia) by Kh. Amirkhanov (2006) [...]»