1. Barlow, E. H.: ?Thymus dependency and in vitro correlates of perimetamorphic tolerance in Xenopus laevis?. Ph. D. thesis, University of Rochester, Rochester, New York 1980
2. Barlow, E. H., DiMarzo, S. J., and Cohen, N.: Prolonged survival of the disparate skin allografts transplanted to the metamorphosing frog, Xenopus laevis. Transplantation 32: 51?57, 1981
3. Benacerraf, B. and Unanue, E. R.: Textbook of Immunology, pp. 166?177, The Williams and Wilkins Company, Baltimore 1979
4. Bernardini, N., Chardonnens, X., and Simon, D.: Tolérance aux allogreffes cutanées chez Xenopus laevis. Influence de la taille et de lâge du greffon. C. R. Acad. Sci. Paris. 270: 2351?2354, 1970
5. Billingham, R. E.: The passenger cell concept in transplantation immunology. Cell. Immunol. 2: 1?21, 1971