A hint of Poincaré dodecahedral topology in the WMAP first year sky map B. F. Roukema, B. Lew, M. Cechowska, A. Marecki and S. Bajtlik A&A, 423 3 (2004) 821-831 Published online: 12 August 2004 DOI: 10.1051/0004-6361:20040337