1. M. Balkanski, R.C.C. Leite, S.P.S. Porto (eds.): Proceedings of the 3rd International Conference on Light Scattering in Solids (Flammarion, Paris 1976)
2. K.A. Müller, A. Rigamonti (eds.): Proceedings of the International School of Physics ‘Enrico Fermi’, Course LIX. Local Properties at Phase Transitions (North-Holland, Amsterdam 1976)
3. E.J. Samuelson, E. Anderson, J. Feder (eds.): Structural Phase Transitions and Soft Modes (Universitetsforlaget, Oslo 1971)
4. Y. Farge: Nuovo Cimento 39, 356 (1977)
5. I.R. Jahn, H. Dachs: Fortschr. Mineral. 51, 176–239 (1974)