1. AllwoodG., AsherssonG. L., DaveyM. J. & GoodfordR. J., 1971. Immunology 21: 509?515.
2. CooperbandS. R., BadgerA. M., DavisR. C., SchmitK. & ManninckJ. A., 1972. J. Immunol. 109: 154?163.
3. CurtissL. K. & EdgingtonT. S., 1976. J. Immunol. 116: 1452?1458.
4. GillisS., FermM. M., OuW. & SmithK. A., 1978. J. Immunol. 120: 2027?2032.
5. KeyJ. E. & MattsonA., 1979. Biochem. Soc. Trans. 7: 1009?1011.