Basic two-dimensional versions of Hurwitz genus formula Rolf-Peter Holzapfel OriginalPaper Pages: 1 - 70
A Penrose transform for the twistor space of an even dimensional conformally flat Riemannian manifold Michael K. Murray OriginalPaper Pages: 71 - 88
Einstein-Weyl spaces and (1 , n) -curves in the quadric surface Henrik Pedersen OriginalPaper Pages: 89 - 120
A characteristic class for totally real surfaces in the Grassmannian of two-planes in four-space Thomas Fiedler OriginalPaper Pages: 121 - 132