Discovery of circular polarization in the Intermediate Polar 1WGA J1958.2+3232 M. Uslenghi, L. Tommasi, A. Treves, V. Piirola and P. Reig A&A, 372 1 (2001) L1-L4 Published online: 15 June 2001 DOI: 10.1051/0004-6361:20010478