1) Journal of Chromatography A
Volume 1055, Issues 1-2, 5 November 2004, Pages 71-76
"Preparative isolation and purification of coumarins from Cnidium monnieri (L.) Cusson by high-speed counter-current chromatography"
Renmin Liu
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http://dx.doi.org/10.1016/j.chroma.2004.09.017