Wigren, Anders, John Falk, and Ove Wik. 1978. “The Healing of Cartilage Injuries Under the Influence of Joint Immobilization and Repeated Hyaluronic Acid Injections: An Experimental Study”. Acta Orthopaedica 49 (2):121-33. https://doi.org/10.3109/17453677809005737.