Méndez-González, Y., 		Pentón-Madrigal, A., 		Peláiz-Barranco, A., AND 		Calderón-Piñar, F..
"Spontaneous Strain as Order Parameter to Describe the Phase Transition in La3+ Doped Pbtio3 Ferroelectric Perovskite" <em>Revista Cubana de Física</em> [Online], Volume 29 Number 2 (14 December 2012)