Ammonia observations in the LBV nebula G79.29+0.46 - Discovery of a cold ring and some warm spots J. R. Rizzo, Aina Palau, F. Jiménez-Esteban and C. Henkel A&A, 564 (2014) A21 Published online: 28 March 2014 DOI: 10.1051/0004-6361/201323170