Geometric techniques in gauge theories proceedings of the Fifth Scheveningen Conference on Differential Equations, the Netherlands, August 23-28, 1981 / edited by R. Martini and E.M. de Jager. - Martini, R. (Rodolfo), 1943-; Jager, E. M. de (Eduardus Marie de) (Lecture notes in mathematics (Springer-Verlag) ;, 1982)