1. Upper extremity regional anesthesia;Neal;essentials of our current understanding, 2008,2009
2. Nerve stimulation in regional anesthesia;De Andres;theory and practice,2005
3. Electrical nerve location;Bashein;numerical and electrophoretic comparison of insulated vs uninsulated needles,1984
4. Peripheral nerve stimulators;Hadzic;cracking the code - one at a time,2004
5. High or low current threshold for nerve stimulation for regional anaesthesia;Steinfeldt;Acta Anaesthesiol Scand,2009