Uji aktivitas, stabilitas fisik dan keamanan sediaan gel pencerah kulit yang mengandung ekstrak jamur tiram (pleurotus ostreatus) = Activity assay, physical stability and safety tests of skin lightening gel containing oyster mushroom (pleurotus ostreatus) extract - Riani Hapsari Nawawi, author (Program Pascasarjana Universitas Indonesia, 2012)