1. Bennett, K.D., 1998a. PSIMPOLL 4.10: ‘C’ Programs for analysing and plotting pollen data. Available from the Department of Quaternary Geology, University of Uppsala at URL http://www.kv.geo.uu.se/software.html.
2. Bennett, K.D., 1998b. Documentation for psimpoll 4.10 and pscomb 1.03. Available from the Department of Quaternary Geology, University of Uppsala at URL http://www.kv.geo.uu.se/software.html.
3. Pollen;Bennet,2001
4. Numerical Methods in Quaternary Pollen Analysis;Birks,1985
5. The importance of low atmospheric CO2 and fire in promoting the spread of grasslands and savannas;Bond;Global Change Biol.,2000