Search for dense molecular gas in two QSO host galaxies J.-U. Pott, A. Eckart, M. Krips, L. E. Tacconi-Garman and E. Lindt A&A, 456 2 (2006) 505-508 Published online: 31 August 2006 DOI: 10.1051/0004-6361:20065063