1. ASAKAWA, S. (1969) : Effects of the lymphocytosis-promoting factor of Bordetella pertussis on antibody production in mice. Japan. J. Med. Sci. Biol., 22, 23-42.
2. BARNES, J. M. AND HOLT, L. B. (1963) : A comparison of the antigenicity characteristics of the W. H. O. international standard diphtheria formol toxoid with a routine purified diphtheria formol toxoid. Brit. J. Exptl. Pathol., 44, 561-567.
3. BARB, M. (1957) : The preparation, compositition and control of combined vaccines. Combined vaccines containing tetanus toxoid. Proc. 3rd. Inter. Meet. Biol. Standard. Opatija, 139-150.
4. CHRISTENSEN, P. A., MASON, J. H. AND ROBINSON, M. (1962) : The assay of diphtheria toxoids in guinea-pigs, with particular reference to the number of injection given. Bull. Wld Hlth Org., 26, 389-395.
5. DOCUMENT OF THE MINISTRY OF HEALTH AND WELFARE (1968) : Minimum Requirement for Tetanus Antitoxin.