Luminous HC3N line and the HCN/HCO+ ratio in NGC 4418 - Buried AGN or nascent starburst? S. Aalto, R. Monje and S. Martín A&A, 475 2 (2007) 479-485 Published online: 17 September 2007 DOI: 10.1051/0004-6361:20077366