“A Comparison of Using Crystalloid Preloading and Co-Loading in Caesarean Section Operation Under Spinal Anaesthesia and Its Association with Spinal Anaesthesia Induced Hypotension and Heart Rate Variability”, J Dhaka Med Coll, vol. 29, no. 1, pp. 12–17, Jan. 2021, doi: 10.3329/jdmc.v29i1.51164.