Belfrage, Ola, et al. “Local Treatment of Cancellous Bone Grafts With BMP-7 and Zoledronate Increases Both the Bone Formation Rate and Bone Density”. Acta Orthopaedica, vol. 82, no. 2, Apr. 2011, pp. 228-33, doi:10.3109/17453674.2011.566138.