Shkatula, Y. V., and OblaznitskyyV. М. “The Use of Sonography When Performing Differential Diagnostics of Legg- Calv- Perthes Disease and Transient Synovitis”. Biomedical and Biosocial Anthropology, no. 25, Mar. 2017, pp. 183-7, https://bba-journal.com/index.php/journal/article/view/106.