Ricardo The topic presented by Martin Kropff at the summer 1994 course at Gainesville should not be cited relative to our course, because it will not be published in that manner. I suggest that you contact Martin Kropff directly. The topic was presented at a "Rice and Climate Change" Symposium at IRRI in March 1994 and there is a proceedings of some type resulting from that symposium. Try "M.J. [log in to unmask]" Good luck. Ken Boote