Nojima, Takayuki, Katsushige Yamashiro, Masahiro Fujita, Kazuo Isu, Yuji Ubayama, and Shinya Yamawaki. 1991. “A Case of Osteosarcoma Arising in a Solitary Osteochondroma”. Acta Orthopaedica 62 (3):290-92. https://doi.org/10.3109/17453679108993613.