Nagar, S., Paliwal, N., Lohia, R., Saluja, V. and Dutt, N. 2024. Comparative study of two thoracic segmental spinal anaesthesia techniques for laparoscopic cholecystectomy: low-dose hypobaric ropivacaine and isobaric ropivacaine at T10-11 intervertebral space vs. standard technique using isobaric levo bupivacaine at T8-T10 intervertebral space. International Journal of Clinical Trials. 11, 1 (Jan. 2024), 17–23. DOI:https://doi.org/10.18203/2349-3259.ijct20240040.