D. C. Tadu, D. Suwalka, D. L. Lakra, and D. A. Sinha, “Intrathecal 0.75% Isobaric Ropivacaine Versus 0.5% Heavy Bupivacaine For Elective Caesarean Delivery: A Randomized Comparative Study In Hundred Patient’s: Intrathecal 0.75% Isobaric Ropivacaine Versus 0.5% Heavy Bupivacaine”, Natl J Integr Res Med, vol. 5, no. 6, pp. 44–48, Jan. 2018.