Frachetti, Michael D., Robert N. Spengler III, Gayle J. Fritz, and Alexei N. Mar’yashev. 2010. Earliest Direct Evidence for Broomcorn Millet and Wheat in the Central Eurasian Steppe Region. Antiquity 84:993-1010. Peer-reviewed.
Spengler, Robert N., III. 2008. Archaeobotanical Analysis of the Begash Site: Plants as a Component of Mobile Pastoralism. St. Louis: Unpublished Master’s Thesis, available in the Anthropology Department at Washington University.