Aptroot, Andre; van Geel, Bas (2006). "Fungi of the colon of the Yukagir Mammoth and from stratigraphically related permafrost samples". Review of Palaeobotany and Palynology. 141 (1–2): 225–230. Bibcode:2006RPaPa.141..225A. doi:10.1016/j.revpalbo.2005.04.006.
Aptroot, Andre; van Geel, Bas (2006). "Fungi of the colon of the Yukagir Mammoth and from stratigraphically related permafrost samples". Review of Palaeobotany and Palynology. 141 (1–2): 225–230. Bibcode:2006RPaPa.141..225A. doi:10.1016/j.revpalbo.2005.04.006.