Identification of four RXTE Slew Survey sources with nearby luminous active galactic nuclei M. Revnivtsev, S. Sazonov, E. Churazov and S. Trudolyubov A&A, 448 3 (2006) L49-L52 Published online: 03 March 2006 DOI: 10.1051/0004-6361:200500233