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Gamboa Mutuberria, José Manuel and Bujalance, E. and Conder, M.D.E and Gromadzki, G. and Izquierdo, Milagros (2002) Double Coverings Of Klein Surfaces By A Given Riemann Surface. Journal Of Pure And Applied Algebra, 169 (2-3). pp. 137-151. ISSN 0022-4049