Rubak, Jens M., Mikko Poussa, and Vejho Ritsilá. 1982. “Chondrogenesis in Repair of Articular Cartilage Defects by Free Periosteal Grafts in Rabbits”. Acta Orthopaedica 53 (2):181-86. https://doi.org/10.3109/17453678208992198.