1. Ahnström, G., Natarajan, A. T., and Velemínský J. (1970), in preparation.
2. Amano, E., and Smith, H. H. (1965), Mutation Res. 2, 344.
3. Arnason, T. J., Mohammed, L., Koehler, D., and Renneberg, F. M. (1962), Can J. Genet. Cytol 4, 172
4. Augustinsson, K.-B., and Olsson, B. (1961), Hereditas 47, 1.
5. Avanzi, S., Brunori, A., D’Amato, F., Nuti Ronchi, V., and Scarascia-Mugnozza, G. T. (1963), Caryologia 16, 553