Paavolainen, Pekka, Sirpa Mäkisalo, Kaj Skutnabb, and Teddy Holmström. 1993. “Biologic Anchorage of Cruciate Ligament Prosthesis: Bone Ingrowth and Fixation of the Gore-Tex® Ligament in Sheep”. Acta Orthopaedica 64 (3):323-28. https://doi.org/10.3109/17453679308993636.