The new cataclysmic variable RX J1554.2+2721 in the period gap G. H. Tovmassian, J. Greiner, S. V. Zharikov, J. Echevarría and A. Kniazev A&A, 380 2 (2001) 504-515 Published online: 15 December 2001 DOI: 10.1051/0004-6361:20011434