Paavolainen, P., P. Slätis, J. Ahonen, and E. Karaharju. 1978. “Changes in Calcium and Hydroxyproline Content of Cortical Bone After Compression and Neutral Plate Fixation”. Acta Orthopaedica 49 (6):492-96. https://doi.org/10.3109/17453677808993228.