M. H. . Beg, O. A. Mateen, T. A. . Khan, S. Irfan, K. . Buland, and J. . Zafar, “Comparison of Analgesic Efficacy of Pectoralis Type II Block (PECS-II) Versus Erector Spinae Block (ESP) After Modified Radical Mastectomy”, Pak Armed Forces Med J, vol. 76, no. 5, pp. 613–617, Sep. 2026, doi: 10.51253/pafmj.v76i5.10373.