Kalm, Volli; Gorlach, Aleksandr (2014). "Impact of bedrock surface topography on spatial distribution of Quaternary sediments and on the flow pattern of late Weichselian glaciers on the East European Craton (Russian Plain)". Geomorphology. 209: 1–9. Bibcode:2014Geomo.207....1K. doi:10.1016/j.geomorph.2013.10.022.
Kalm, Volli; Gorlach, Aleksandr (2014). "Impact of bedrock surface topography on spatial distribution of Quaternary sediments and on the flow pattern of late Weichselian glaciers on the East European Craton (Russian Plain)". Geomorphology. 209: 1–9. Bibcode:2014Geomo.207....1K. doi:10.1016/j.geomorph.2013.10.022.