Dynamical Jahn-Teller coupling of Fe2+ in the cluster approach applied to the Mössbauer quadrupole data of 57Fe doped K2ZnF4 and Ba2ZnF6 A. Ducouret-Cereze et F. VarretJ. Phys. France, 49 4 (1988) 661-666DOI: https://doi.org/10.1051/jphys:01988004904066100