Krylov, Alexey A.; Andreeva, Irina A.; Vogt, Christoph; Backman, Jan; Krupskaya, Viktoria V.; Grikurov, Garrik E.; Moran, Kathryn; Shoji, Hitoshi (2008): A shift in heavy and clay mineral provenance indicates a middle Miocene onset of a perennial sea ice cover in the Arctic Ocean. American Geophysical Union, Washington, DC, United States, Paleoceanography, 23 (1), georefid:2010-051008