Mössbauer absorption and emission experiments in CaF2(57Fe): relaxation and after-effect study C. Garcin, P. Imbert, G. Jéhanno, J.R. Régnard, G. Férey, M. Leblanc and A. Gérard J. Phys. France, 47 11 (1986) 1977-1988 DOI: 10.1051/jphys:0198600470110197700