Acharya, S., M. Marhatta, and R. Amatya. “Unexplained Apnoea and Loss of Consciousness During Sub Arachnoid Block for Caesarean Section”. Kathmandu University Medical Journal, vol. 7, no. 4, Feb. 2010, pp. 419-22, doi:10.3126/kumj.v7i4.2766.