Constraining the thermal history of the warm-hot intergalactic medium L. Zappacosta, R. Maiolino, A. Finoguenov, F. Mannucci, R. Gilli and A. Ferrara A&A, 434 3 (2005) 801-809 Published online: 18 April 2005 DOI: 10.1051/0004-6361:20040371