Herschel/HIFI deepens the circumstellar NH3 enigma K. M. Menten, F. Wyrowski, J. Alcolea, E. De Beck, L. Decin, A. P. Marston, V. Bujarrabal, J. Cernicharo, C. Dominik, K. Justtanont et al. (16 more) A&A, 521 (2010) L7 Published online: 01 October 2010 DOI: 10.1051/0004-6361/201015108