1. Acton, R.T., Morris, R.J., and Williams, A.F., 1974, Eur. J. Immunol.: 4:598.
2. Allan, D., Auger, J., and Crumpton, M.J., 1972, Nature (London) New Biol.: 236:23.
3. Antoine, J.C., and Avrameus, S., 1974, Eur. J. Immunol.: 4:468.
4. Bachvaroff, R., Galdiero, F., and Grabar, P., 1969, J. Immunol.: 103:953.
5. Barclay, A.N., Letarte-Muirhead, M., and Williams, A.F., 1975, Biochem. J.: 151:699.