Ghulam Murtaza Shaikh, Muhammad Muazzam Butt, Mohsin Riaz Askri, Eram Shahzadi, Shumyala Maqbool, Syed Imtiaz Ali Zaidi, “Analgesia after Lower Abdominal Surgery in Children Treated with Caudal Bupivacaine Versus a Bupivacaine-Tramadol Combination”, Pakistan Journal of Medical & Health Sciences, vol. 17, no. 11, p. 137, Nov. 2023.