R. Sigit, K. D. Rahayu, P. Nadiyah, H. Yuniarti, and .-. Anwar, “Automatic Detection of Fetal Head and Fetal Measurement on Birth Time Estimation”, Int. J. Adv. Sci. Eng. Inf. Technol., vol. 10, no. 2, pp. 447–454, Mar. 2020.