Blaauw, Maarten, Bas van Geel, Iris Kristen, Birgit Plessen, Anna Lyaruu, Daniel R. Engstrom, Johannes van der Plicht, and Dirk Verschuren. "High-resolution 14 C dating of a 25,000-year lake-sediment record from equatorial East Africa." Quaternary Science Reviews 30, no. 21 (2011): 3043-3059.
Blaauw, Maarten, Bas van Geel, Iris Kristen, Birgit Plessen, Anna Lyaruu, Daniel R. Engstrom, Johannes van der Plicht, and Dirk Verschuren. "High-resolution 14 C dating of a 25,000-year lake-sediment record from equatorial East Africa." Quaternary Science Reviews 30, no. 21 (2011): 3043-3059.