1. Klein, G., Clifford, P., Klein, E., and Stjernswärd, J., Proc. US Nat. Acad. Sci., 55, 1628 (1966).
2. Klein, G., Clifford, P., Klein, E., and Stjernswärd, J., UICC Monog. Ser., 8, 209 (1967).
3. Klein, E., Clifford, P., Klein, G., and Hamberger, C. A., Intern. J. Cancer, 2, 27 (1967).
4. Klein, G., Clifford, P., Klein, E., Smith, R. T., Minowada, J., Kourilsky, F. M., and Burchenal, J. H., J. Nat. Cancer Inst., 39, 1027 (1967).
5. Klein, G., Pearson, G., Nadkarni, J. S., Nadkarni, J. J., Klein, E., Henle, G., Henle, W., and Clifford, P., J. Exp. Med., 128, 1011 (1968).