The IRAM-30m line survey of the Horsehead PDR - I. CF+ as a tracer of C+ and as a measure of the fluorine abundanceV. Guzmán, J. Pety, P. Gratier, J. R. Goicoechea, M. Gerin, E. Roueff and D. TeyssierA&A, 543 (2012) L1DOI: https://doi.org/10.1051/0004-6361/201219449
