1. Habermann,V.: The degradation of apyrimidinic deoxyribonucleic acid in alkali. A method for the isolation of purine nucleotide sequences from deoxyribonucleic acid. Biochim. biophys. Acta (Amst.) 55, 999 (1962).
2. Kagawa, H., Takiguchi, H.: Enzymatic study on the decomposition of ascorbic acid. Symp. Enzyme Chem. Japan 16, 107 (1962).
3. Murakami, H., Yamafuji, K.: Mode of action of some catecholamines and sugar oximes on deoxyribonucleic acid. Enzymologia 38, 337 (1970).
4. Mushynski, W. E., Spencer, J. H.: Nucleotide clusters in deoxyribonucleic acids. V. The pyrimidine oligonucleotides of strands r and l of bacteriophage T7 DNA. J. molec. Biol. 52, 91 (1970).
5. Nakamura, Y., Yamafuji,K.: Antitumour activities of oxidized products of ascorbic acid. Sci. Bull. Fac. Agr. Kyushu Univ. 23, 119 (1968).