Shrestha, Ashish, et al. “The Role of Aspartate Aminotransferase to Platelet Ratio Index As a Non-Invasive Predictor of Variceal Etiology of Upper Gastrointestinal Bleeding”. Journal of Lumbini Medical College, vol. 8, no. 2, Sept. 2020, pp. 206-11, https://nepjol.info./index.php/JLMC/article/view/40817.