1. Are pencil point needles safe for subarachnoid block?;Collier;Anaesthesia,1998
2. Deflection of spinal needles by the bevel;Drummond;Anaesthesia,1980
3. Importance of the needle bevel during spinal and epidural anesthesia;Baumgarten;Regional Anesthesia,1995
4. The effects of needle type, gauge, and tip bend on spinal needle deflection;Sitzman;Anesthesia and Analgesia,1996
5. Spinal needle deflection in the combined spinal-epidural technique;Eldor;Anesthesia and Analgesia,1996