Elhamid, B. A., S. Samy, A. Abdullah, A. Saad, M. Ollaek, and A. Ahmed,  "Ketamine versus neostigmine as adjuvants to bupivacaine during ultrasound-guided serratus anterior plane block in modified radical mastectomy. A randomized controlled trial",  Egyptian Journal of Anesthesia. , vol. 37, issue 1, pp. 356?363, 2021.