Methanol as a diagnostic tool of interstellar clouds - I. Model calculations and application to molecular cloudsS. Leurini, P. Schilke, K. M. Menten, D. R. Flower, J. T. Pottage and L.-H. XuA&A, 422 2 (2004) 573-585DOI: https://doi.org/10.1051/0004-6361:20047046