TY - BOOK AU - Hitchin N J AU - Segal G B AU - Ward R S TI - Integrable systems: twistors, loop groups, and Riemann surfaces SN - 0-19-850421-7 U1 - 515.355 PY - 1999/// CY - Oxford PB - Clarendon Press KW - Integrable systems KW - Nonlinear differential equations N1 - Based on lectures given at a conference on integrable systems held at the Mathematical Institute, University of Oxford, in September 1997 ER -