Comparative study of CH+ and SH+ absorption lines observed towards distant star-forming regionsB. Godard, E. Falgarone, M. Gerin, D. C. Lis, M. De Luca, J. H. Black, J. R. Goicoechea, J. Cernicharo, D. A. Neufeld, K. M. Menten and M. EmprechtingerA&A, 540 (2012) A87DOI: https://doi.org/10.1051/0004-6361/201117664
