Incoherent inelastic neutron scattering measurements on ice VII: Are there two kinds of hydrogen bonds in ice?S. Klotz, Th. Strässle, C. G. Salzmann, J. Philippe and S. F. ParkerEurophys. Lett., 72 4 (2005) 576-582DOI: https://doi.org/10.1209/epl/i2005-10270-4