A direct observation of tunnelling states in molecular solids with random internal strainsP. S. Goyal, S. L. Narasimhan, A. Inaba, W. Kagunya and C. J. CarlileEurophys. Lett., 39 5 (1997) 509-514DOI: https://doi.org/10.1209/epl/i1997-00385-6