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Persson, C. M., Hajigholi, M., Hassel, G. E., Olofsson, A. O. H., Black, J. H., Herbst, E., Mueller, H. S. P., Cernicharo, J., Wirstrom, E. S., Olberg, M., Hjalmarson, A., Lis, D. C., Cuppen, H. M., Gerin, M. and Menten, K. M. (2014). Upper limits to interstellar NH+ and para-NH2- abundances Herschel-HIFI observations towards Sgr B2 (M) and G10.6-0.4 (W31C). Astron. Astrophys., 567. LES ULIS CEDEX A: EDP SCIENCES S A. ISSN 1432-0746