Ivanov, Y., Patrikov, K., Slavchev, S. and Andreev, A. 2023. Our Experience with the Modular Universal Tumour and Revision System in Pediatric Patients with Ewing’s Sarcoma – Report of Six Cases. Proceedings of the Bulgarian Academy of Sciences. 76, 2 (Feb. 2023), 302–308. DOI:https://doi.org/10.7546/CRABS.2023.02.15.