1. Fra Angelico, c1395–1455, Ss Cosmas and Damian.
2. Genesis. 2: 21–22.
3. Die verwendung der freien knochenplastik nebast veruchen uber gelenkversteifung und gelenktransplantation;Lexer;Arch Klin Chir,1908
4. Formation by auto induction;Urist;Science,1965
5. W.T. Articular cartilage repair: Behavior of rabbit chondrocytes during tissue culture and subsequent allografting;Green;Clin Orthop Relat Res,1977