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Trotta, M., Peira, E., Debernardi, F., & Gallarate, M. (2002). Elastic liposomes for skin delivery of dipotassium glycyrrhizinate. International Journal of Pharmaceutics, 241(2), 319–327. doi:10.1016/s0378-5173(02)00266-1 
10.1016/S0378-5173(02)00266-1