Gürses, M.2016-02-082016-02-0819920377-9017http://hdl.handle.net/11693/26098It is proved that the boundary value problems of some sigma-models in a non-Riemannian background have unique solutions. Sigma models on Riemannian backgrounds, sigma models with a Wess-Zumino-Witten term, the Ward model, and the self-dual Yang-Mills equations are among these models. © 1992 Kluwer Academic Publishers.EnglishMathematics Subject Classifications (1991): 81E13, 81E20, 35J60, 35J65Article10.1007/BF00420235