Upper limits to interstellar NH+ and para-NH2− abundances - Herschel-HIFI observations towards Sgr B2 (M) and G10.6−0.4 (W31C)
, , , , , , , , ,A&A, 567 (2014) A130
Published online: 29 July 2014
DOI: 10.1051/0004-6361/201423748