Kawamura, Sadahito, et al. “Articular Cartilage Repair: Rabbit Experiments With a Collagen Gel-Biomatrix and Chondrocytes Cultured in It”. Acta Orthopaedica, vol. 69, no. 1, Jan. 1998, pp. 56-62, doi:10.3109/17453679809002358.