Kulshreshtha, Megha, et al. “Assessment of Cardiovascular Sympathetic Function Tests in Premenstrual Syndrome Patients Visiting Tertiary Care Hospital: A case–control Study”. Asian Journal of Medical Sciences, vol. 12, no. 12, Dec. 2021, pp. 108-13, https://nepjol.info/index.php/AJMS/article/view/39593.