Narain, V. S., V. K. Puri, R. K. Saran, R. Thakur, S. K. Dwivedi, and M. Hasan. “Isolated Septal Perforator Block In A Patient With Unstable Angina:”. Pakistan Heart Journal, vol. 22, no. 3, Aug. 2012, doi:10.47144/phj.v22i3.303.