^Kato M, Ikeda Y (1968). "On the deoxyribonucleases, K1 and K2, isolated from mycelia of Aspergillus oryzae. I. Isolation and purification of DNases K1 and K2". J. Biochem. 64 (3): 321–8. PMID4303413.
^Shishido K, Kato M, Ikeda Y (1968). "Isolation of thymidylic acid-rich fragments from double-stranded deoxyribonucleic acids". J. Biochem. 65: 479–481.