The Porosity of the neutral ISM in 20 THINGS GalaxiesI. Bagetakos, E. Brinks, F. Walter, W.J.G. de Blok, A. Usero, A.K. Leroy, J.W. Rich and R.C. KennicuttEAS Publications Series, 52 (2011) 103-106DOI: https://doi.org/10.1051/eas/1152015