Abundances of sulphur molecules in the Horsehead nebula - First NS+ detection in a photodissociation regionP. Rivière-Marichalar, A. Fuente, J. R. Goicoechea, J. Pety, R. Le Gal, P. Gratier, V. Guzmán, E. Roueff, J. C. Loison, V. Wakelam and M. GerinA&A, 628 (2019) A16DOI: https://doi.org/10.1051/0004-6361/201935354
