Shakti Singhal and Gunjan Agrawal 2018. A comparative study of ropivacaine 0.5% versus ropivacaine 0.75% for spinal anesthesia in lower limb orthopedic surgery in ASA Grade – I/II adult patients: A prospective study. Asian Pacific Journal of Health Sciences. 5, 2 (Jun. 2018), 65–75. DOI:https://doi.org/10.21276/apjhs.2018.5.2.14.