Chowdhury, I. H., Begum, H., Begum, A., Akhtaruzzaman, A., & Iqbal, K. (2009). Evaluation of Tip Holed Spinal Needle - A Comparative Study. Journal of the Bangladesh Society of Anaesthesiologists, 18(1), 3–8. https://doi.org/10.3329/jbsa.v18i1.4030