Lisnyy, I. I., O. E. Chechelnitskiy, and V. M. Emets. “The Frequency of Mosaic Epidural Block During Labour. The Comparison of Two Kinds of Epidural Catheters”. Pain Medicine, vol. 1, no. 2, June 2016, https://painmedicine.org.ua/index.php/pnmdcn/article/view/14.