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A study of (1,1) supersymmetric two-dimensional non-linear sigma models withboundary on special holonomy target spaces is presented. In particular, theconsistency of the boundary conditions under the various symmetries is studied.Models both with and without torsion are discussed.Comment: 20 pages. Minor errors corrected, some new results on the symmetry  algebra added, and a connection for the bi-G_2 structure derive

Special holonomy sigma models with boundaries