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Rani, Z., Julia Reveny and Urip Harahap 2021. Utilization Of Glycerol By Product From Transesterification Of Waste Cooking Oil As A Cosurfactant In Nanocream Preparation . International Journal of Science, Technology & Management. 2, 4 (Jul. 2021), 1258-1264. DOI:https://doi.org/10.46729/ijstm.v2i4.264.