Dense gas in nearby galaxies - XV. Hot ammonia in NGC 253, Maffei 2 and IC 342R. Mauersberger, C. Henkel, A. Weiß, A. B. Peck and Y. HagiwaraA&A, 403 2 (2003) 561-571DOI: https://doi.org/10.1051/0004-6361:20030386