Guo BH, Cheng Y, Wu W, Lin LP, Lin DH. HPLC assay and pharmacokinetics and tissue distribution study of glycyrrhetinic acid liposomes modified with galactosylated lipid. J Liposome Res. 2012 Jun;22(2):120–7. doi: 10.3109/08982104.2011.627515. PMID: 22313057.