Polarimetry of sunspot penumbrae with high spatial resolution N. Bello González, O. V. Okunev, I. Domínguez Cerdeña, F. Kneer and K. G. Puschmann A&A, 434 1 (2005) 317-327 Published online: 01 April 2005 DOI: 10.1051/0004-6361:20042001