Sikandar, Zeeshan, et al. “Omparison of CSMC (Cedar Sinai Medical Center) QGS QPS (Quantitative Gated SPECT Quantitative Perfusion SPECT) and INVIA-4 Dimension Myocardial SPECT Softwares for Quantitative Analysis of Left Ventricular Perfusion and Function in Gated Myocardial SPECT Scintigraphy”. Pakistan Armed Forces Medical Journal, vol. 75, no. 4, Aug. 2025, pp. 684-8, https://doi.org/10.51253/pafmj.v75i4.10764.