Voroniak, D. I., O. S. Godik, I. V. Kolomoiets, and O. G. Dubrovin. “Efficacy of the Staged Endoscopic Ligature of the Varicose Veins in Children, Suffering Portal Hypertension”. Klinicheskaia khirurgiia 86, no. 10 (October 21, 2019): 24-27. Accessed July 4, 2022. https://hirurgiya.com.ua/index.php/journal/article/view/746.