1. Nairn, R. C., Richmond, H. G., McEntegart, M. G., and Fothergill, J. E., Brit. Med. J., ii, 1335 (1960).
2. Deckers, C., Structure Antigénique de Tumeurs Expérimentales (Éditions Arscia S.A., Brussels, 1964).
3. Carruthers, C., and Baumler, A., J. Nat. Cancer Inst., 34, 191 (1965).
4. Fel, V. J., and Tsikarishvili, T. N., Cancer Res., 24, 1675 (1964).
5. Baldwin, R. W., Brit. J. Cancer, 18, 285 (1964).