W. C. Ky, M. H. Fauzi, A. Rahman, M. F. Mohd Shukri, T. H. Tuan Kamauzaman, and M. N. Abdul Ghani, “Point-of-Care Ultrasound (POCUS) and Epsilon wave”, Int. J. Hum. Health Sci., vol. 6, no. 1, pp. 136–139, Feb. 2022.