Authors 
														   Denis Auroux
							     							   
							   Department of Mathematics, Massachusetts Institute of Technology, Cambridge, MA 02139, United States							   							   
							   
														   Ludmil Katzarkov
							     							   
							   Department of Mathematics, University of Miami, Coral Gables, FL  33146, United States, and Department of Mathematics, University of California, Irvine, Irvine, CA 92697, United States							   							   
							   
														   Dmitri Orlov
							     							   
							   Steklov Mathematical Institute, Russian Academy of Sciences, 119991 Moscow, Russia