Vampugalla, P.S., Vundi, V.R., Perumallapalli, K.S., Kumar, C.V., Kambar, C., Mahalakshmi, P.M. and Pisipati, R.S. 2017. A comparative study of intrathecal ropivacaine with fentanyl and L-bupivacaine with fentanyl in lower abdominal and lower limb surgeries. International Journal of Basic & Clinical Pharmacology. 4, 6 (Jan. 2017), 1147–1155. DOI:https://doi.org/10.18203/2319-2003.ijbcp20151349.