Maxwell CA, Edwards R, Dixon RA (1992). “Identification, purification, and characterization of S-adenosyl-L-methionine: isoliquiritigenin 2'-O-methyltransferase from alfalfa (Medicago sativa L.)”. Arch. Biochem. Biophys.293 (1): 158–66. doi:10.1016/0003-9861(92)90379-B. PMID1731632.
Ichimura M, Furuno T, Takahashi T, Dixon RA, Ayabe S (1997). “Enzymic O-methylation of isoliquiritigenin and licodione in alfalfa and licorice cultures”. Phytochemistry.44 (6): 991–5. doi:10.1016/S0031-9422(96)00670-X. PMID9055445.