Google = <"Dan Asmimov" Ph.D. shortest> yields http://www.jstor.org/view/07468342/sp060005/06x0043q/0 Apologies: I did not then notice all the 'Reading University' additions in the URL (interposed by UoR's e-library system - impressive!) but http://www.jstor.org/view/07468342/sp060005/06x0043q/6 does the job - for me ... D Asimov, "Flow Manifolds", UC Berkeley (1972), 28pp. At this rate, we will have written more locating Dan's thesis than Dan did in writing it. Guy