1. Selective modification of cytidine residue in ribonucleic acid by semicarbazide;Hayatsu;Biochem. Biophys. Res. Commun.,1964
2. The modification of nucleosides and nucleotides, III. A selective modification of cytidine with semicarbazide;Hayatsu;Biochein. Biophys. Acta,1966
3. The modification of nucleosides and nucleotides, IV. The reaction of seinicarbazide with nucleic acids;Hayatsu;Biochim. Biophys. Acta,1966
4. Modifications of nucleosides and nucleotides, V. A selective modification of cytidylic acids with Girard-P reagent;Kikuoawa;Biochtm. Biophys. Acta,1967
5. modification of nucleosides and nucleotides, VI. The reaction of Cirard-P reagent with transfer ribonucleic acid;Kikuoawa;Biochim. Biophys. Acta,1967