Integrable systems : twistors, loop groups, and Riemann surfaces /

by Hitchin, N. J (Nigel J) 1946-, Hitchin, N. J (Nigel J.), Hitchin, N. J (Nigel J.), 1946-, Hitchin, N. J (Nigel J.), 1946-, Hitchin, N. J (Nigel J.), 1946-
Published 1999