TITLE: Strange Nonchaotic Attractors in Harper Maps AUTHORS: Alex Haro(1) and Joaquim Puig (2) (1) Dept. de Matematica Aplicada i Analisi, Universitat de Barcelona, Gran Via 585, Barcelona 08007, Spain. E-mail: haro@mat.ub.es (2) Dept. de Matematica Aplicada I, Universitat Politecnica de Catalunya, Diagonal 647, Barcelona 08028, Spain. E-mail: joaquim.puig@upc.edu ABSTRACT: We study the existence of Strange Nonchaotic Attractors (SNA) in the family of Harper maps, proving that they are typical but not robust in this family. Our approach is based on the theory of linear skewproducts and the spectral theory of Schrödinger operators. PACS NUMBERS: 05.45.-a 05.45.Df 47.52.+j 47.53.+n