Müngen, Eren, et al. “Primary Spinal Multifocal Intradural-Extramedullary Ewing Sarcoma in Children: Presentation of a Case and Review of the Literature”. The Turkish Journal of Pediatrics, vol. 63, no. 6, Dec. 2021, pp. 1084-90, https://doi.org/10.24953/turkjped.2021.06.018.