Field tuning of thermally activated magnetic quantum tunnelling in Mn12-Ac moleculesJ. M. Hernández, X. X. Zhang, F. Luis, J. Bartolomé, J. Tejada and R. ZioloEurophys. Lett., 35 4 (1996) 301-306DOI: https://doi.org/10.1209/epl/i1996-00570-7