This thesis essentially deals with two basic problems, one in Rieinannian, the other in Conformal Geometry, described in Part I resp. Part III. Part II can be considered as an interlude serving as a sort of bridge between Riemannian and Comformal Geometry. [Please see attached thesis for remainder of abstract.] application/pdf http://wrap.warwick.ac.uk/99902/1/WRAP_Theses_Salavessa_1987.pdf en QA Graphs with parallel mean curvature and a variational problem in conformal geometry Salavessa, Isabel Thesis SMUR