Ultrasonic, Sonic ans Seismic Waves Velocity in Shale from Tournemire Tunnel. Impact of Anisotropy and Natural FracturesB. Zinszner, P. Meynier, J. Cabrera and P. VolantOil & Gas Science and Technology - Rev. IFP, 57 4 (2002) 341-353DOI: https://doi.org/10.2516/ogst:2002022