Elsayed, A. A., and N. A. Gomaa. “Reference Values and Repeatability of Pulsed-Wave Doppler Flowmetry of Portal Vein in Healthy Dromedary She-Camels”. Journal of Advanced Veterinary and Animal Research, vol. 7, no. 4, Nov. 2020, pp. 698-03, https://banglajol.info/index.php/JAVAR/article/view/75895.