A Herschel [C ii] Galactic plane survey - II. CO-dark H2 in cloudsW. D. Langer, T. Velusamy, J. L. Pineda, K. Willacy and P. F. GoldsmithA&A, 561 (2014) A122DOI: https://doi.org/10.1051/0004-6361/201322406
