“A DOSE-RESPONSE STUDY COMPARING TWO DOSAGES OF HYPOBARIC BUPIVACAINE (WITH FENTANYL 25 MCG) FOR UNILATERAL SPINAL AN ANAESTHESIA IN HIP FRACTURE SURGERY. A RANDOMIZED DOUBLE BLIND PROSPECTIVE COMPARATIVE STUDY OF 5 MG VERSUS 7.5 MG”., Journal of Pharmaceutical Negative Results, pp. 2312–2319, Dec. 2022, doi: 10.47750/pnr.2022.13.S04.285.