Two-dimensional protonic diffusion in a hydrogen-bonded compound CsOH . H2O, studied by solid state NMR J. Gallier, B. Toudic, M. Stahn, R.E. Lechner et H. Dachs J. Phys. France, 49 6 (1988) 949-957 DOI: 10.1051/jphys:01988004906094900