Ngamthipwatthana, T. ., and S. . Phatatharayuttawat. “Efficacy and Safety of Olanzapine in the Treatment of Thai Schizophrenic Patients”. Siriraj Medical Journal, vol. 51, no. 5, May 1999, pp. 337-45, https://he02.tci-thaijo.org/index.php/sirirajmedj/article/view/246994.