M. I. Alam, M. L. Rahman, M. E. Haque, and S. Jesmin, “In high Spinal Block of apnoea is secondary to hypotension but not primary for respiratory muscle paralysis Experience in Rajshahi Medical Collage Hospital”, TAJ: J of Teachers Assoc, vol. 20, no. 2, pp. 144–146, Aug. 2009.