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3. Enchondroma protuberans. Report of a case and its distinction from chondrosarcoma and osteochondroma adjacent to an enchondroma;Crim;Skeletal Radiol,1990
4. Enchondroma protuberans of the rib;Keating;Skeletal Radiol,1985
5. A case of enchondroma protuberans with destroying the rib bone;Isogami;Kyobu Geka,1992