Cheong, BE; Takemura, T; Yoshimatsu, K; Sato, F (2011). “Molecular cloning of an O-methyltransferase from adventitious roots of Carapichea ipecacuanha”. Bioscience, Biotechnology, and Biochemistry. 75 (1): 107–13. doi:10.1271/bbb.100605. PMID21228475.
Cheong, BE; Takemura, T; Yoshimatsu, K; Sato, F (2011). “Molecular cloning of an O-methyltransferase from adventitious roots of Carapichea ipecacuanha”. Bioscience, Biotechnology, and Biochemistry. 75 (1): 107–13. doi:10.1271/bbb.100605. PMID21228475.