Solís, A. A., Bethancourt, J. A., & Britton, G. B. (2008). Chronic sildenafil (Viagra) administration reduces anxiety in intact and castrated male rats. Psicothema, 20(Número 4), 812–817. Recuperado a partir de https://reunido.uniovi.es/index.php/PST/article/view/8735