1. Arai, T., Takahashi, K., Ishiguro, K. and Yazawa, K. (1980). J. Antibiot., 33, 951
2. Arai, T., Takahashi, K. and Kubo, A. (1977). J. Antibiot., 30, 1015
3. Bagley, C. M., Bostick, F. W. and De Vita, V. T. (1973). Cancer Res., 33, 226
4. Berthod, H., Giessner-Prettre, C. and Pullman, A. (1967). Int. J. Quantum Chem., 1, 123.
5. Bodell, W. J., Singer, B., Thomas, G. H. and Cleaver, J. E. (1979). Nucleic Acids Res., 6, 2819