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Pseudo-ternary phase diagrams of oleic acid in the presence of different surfactant/cosurfactant systems. (a) is a Tween 80-based system, (b) is Tween 80 – propylene glycol (4:1), (c) is Tween 80 – propylene glycol – ethanol (4:1:1.8) and (d) is Tween 80 – propylene glycol – ethanol (4:1:5). ME = microemulsion and EM = coarse emulsion.
