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Widji Soeratri and Tristiana Erawati and Noorma Rosita and Fahriyatul Wahyuni (2009) The Influence of Olive Oil Addition on Increasing Arbutin Penetration in the Carbomer 940 Gel (Observation on Inhibition of Enzym Tyrosinase Activity). In: Proceeding The 1st International Conference on Pharmacy and Advanced Pharmaceutical Sciences. Faculty of Pharmacy Universitas Gadjah Mada, Yogyakarta, pp. 78-81. ISBN 978-979-95107-7-8