Pekkarinen, Tarmo, Oili Hietala, Timo Jämsä, and Pekka Jalovaara. 2005. “Effect of Gamma Irradiation on the Osteoinductivity of Morphogenetic Protein Extract from Reindeer Bone”. Acta Orthopaedica 76 (2):231-36. https://doi.org/10.1080/00016470510030625.