Phase transition mechanisms in lanthanide elemental crystals V. P. Dmitriev, A. Yu. Kuznetsov, D. Machon, H.-P. Weber and P. Tolédano Europhys. Lett., 61 6 (2003) 783-789 Published online: 01 March 2003 DOI: 10.1209/epl/i2003-00302-7