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Let G be one of the following groups: L¡(q) and GIA2, q) with q = 3 (mod 4), U3(q) and GU(2, q) with q = 1 (mod 4). This paper is concerned with 2-blocks B of G having semidihedral defect groups. In particular, vertices, sources and Green correspondents of the simple modules in B are determined and used to obtain the submodule structure of the indecomposable projective modules.doi:10.1090/s0002-9947-1979-0546918-4 fatcat:26h34b6cwzgwpgmc3xtinuzltu