R. K. Gupta, B. Langer, P. Singh, R. Kumari, N. Akhtar, and R. Gupta, “Health care providers knowledge, attitudes and perceived barriers towards emergency contraception in a sub-Himalayan state of India”, Int J Reprod Contracept Obstet Gynecol, vol. 7, no. 8, pp. 3244–3249, Jul. 2018.