Structural phase transitions in the perovskite-type layer compound NH3(CH 2)5NH3CdCl4 P. Negrier, M. Couzi, N.B. Chanh, C. Hauw et A. Meresse J. Phys. France, 50 4 (1989) 405-430 DOI: 10.1051/jphys:01989005004040500