1. Acharya, R., Fry, F., Stuart, D., Fox, G., Rowlands, D., and Brown, F. (1989). Nature 337, 709–716.
2. Adam, K. H., Kaaden, V. R., and Strohmaier, K. (1978). Biochem. Biophys. Res. Commun. 84, 677–683.
3. Anderer, F. A., and Schlumberger, H. D. (1965). Biochim. Biophys. Acta 97, 503–509.
4. Arrowsmith, A. E. M. (1977). In Developments in Biological Standardization, Vol. 35 (C. MacKowiak and R. H. Regamey, eds.), pp. 221–230, Karger, Basel.
5. Augé de Mello, P., Honigman, M. H., Fernández, M. V., and Gomes, I. (1970). Bull. Off Int. Epizoot. 73, 489505.