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Varma, Prerna, Vanlal Darlong, Ravinder Pandey, Rakesh Garg, Chandralekha, and Jyotsna Punj. "Comparison of Subarachnoid Block With Bupivacaine and Bupivacaine With Fentanyl On Entropy and Sedation: A Prospective Randomized Double-blind Study." J Anaesthesiol Clin Pharmacol 2014.

Varma, Prerna, et al. "Comparison of Subarachnoid Block With Bupivacaine and Bupivacaine With Fentanyl On Entropy and Sedation: A Prospective Randomized Double-blind Study." J Anaesthesiol Clin Pharmacol 2014.