Fresán, A., R. Apiquian, R. E. Ulloa, C. Loyzaga, H. Nicolini, and L. Gómez. 2003. “Premorbid Functioning by Gender and Its Relationship With Duration of Untreated Phychosis in First Psychotic Episode”. Actas Españolas De Psiquiatría 31 (2):53-58. https://actaspsiquiatria.es/index.php/actas/article/view/944.