Mary Minolin T, Sivasakthi S, Subha E and Suganthi S (2020) “Effectiveness of Billig’s exercise in reducing primary dysmenorrhea among young girls”, International Journal of Research in Pharmaceutical Sciences, 11((SPL 4), pp. 66–69. Available at: https://ijrps.com/home/article/view/1405 (Accessed: 22 January 2025).