Conformal invariants: topics in geometric function theory / by Lars V. Ahlfors. Ahlfors, Lars V. (Lars Valerian), 1907- Conformal invariants. Geometric function theory. Riemann surfaces. 515.9 AHC Bibliography: p. [152]-155. New York ; McGraw-Hill, 1973. 1973. 1973 Text vii, 157 p. eng McGraw-Hill series in higher mathematics