1. Blue, W. T. & Lange, C. F. Immunochemistry 13, 295–298 (1976).
2. Hamers, R., Hamers-Casterman, C., van der Loo, W., Strosberg, A. D. & De Baetselier, P. Z. ImmunForsch. exp. Ther. 149, 187–192 (1975).
3. Braun, D. G. & Jaton, J.-C. Curr. Topics Microbiol. Immun. 66, 29–76 (1974).
4. Montgomery, P. C. & Pincus, J. H. J. Immun. 111, 42–51 (1973).
5. De Baetselier, P., Hamers-Casterman, C., van der Loo, W. & Hamers, R. Immunology 33, 275–284 (1977).