The ESO UVES advanced data products quasar sample - II. Cosmological evolution of the neutral gas mass densityT. Zafar, C. Péroux, A. Popping, B. Milliard, J.-M. Deharveng and S. FrankA&A, 556 (2013) A141DOI: https://doi.org/10.1051/0004-6361/201321154