Yonehara, 1959, J. Antibiotics, ser. A, 12, 109
Takeuchi, 1959, J. Antibiotics, ser. A, 12, 195
Takeuchi, 1961, J. Antibiotics, ser. A, 14, 44
Takeuchi, 1964, J. Antibiotics, ser. A, 17, 267
Levene, 1928, J. Biol. Chem., 79, 475, 10.1016/S0021-9258(20)79938-2