S. Z. Haider, R. A. S. . Khan, M. R. Iqbal, Irum Noor, Muhammad Huzaifa Shareef, and Abid Khan, “Efficacy of Greater Occipital Nerve Block in Treatment and Prevention of Chronic Migraine”, Pak Armed Forces Med J, vol. 76, no. 5, pp. 623–627, Sep. 2026, doi: 10.51253/pafmj.v76i5.11111.