1. 4Liebeck, R. H. "Optimization of Airfoils for Maximum Lift," Ph.D. Thesis,Univ. of Illinois, Urbana, 111.1968; also Liebeck, R. H. and Ormsbee, A. I. "Optimization of Airfoils for Maximum Lift," Journal of Aircraft, Vol. 7, Sept-Oct. 1970, pp. 409-415.