I went to a very interesting talk by Karen King on this topic. At the time she was affiliated with Michigan State University, but I believe she is now with NYU. She would be a good resource if you are looking for articles on the subject. Sincerely, Erin :!:!:!:!:!:!:!:!:!:!:!:!:!:!:!:!:!:!:!:!:!:!:!:!:!!!!!!!!!!!!!!!!!!!!!!!!!!!!!! Erin McNicholas Department of Mathematics University of Arizona (520) 621-6896 "Things are not all so comprehensible and utterable as people would mostly have us believe; most events are unutterable, consummating themselves in a sphere where word has never trod..." -Rainer Maria Rilke !!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!! !