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. Sofia, Bulgaria, 76(2), pp. 302–308. doi: 10.7546/CRABS.2023.02.15.