Penny Ratanarojanatam และผู้แต่งคนอื่นๆ. (1997) Clean-up of oily waste water by froth flotation : effect of microemulsion formation by surfactant mixtures. Chulalongkorn University.:ม.ป.ท.Penny Ratanarojanatam และผู้แต่งคนอื่นๆ. 1997. Clean-up of oily waste water by froth flotation : effect of microemulsion formation by surfactant mixtures. ม.ป.ท.:Chulalongkorn University.;Penny Ratanarojanatam และผู้แต่งคนอื่นๆ. Clean-up of oily waste water by froth flotation : effect of microemulsion formation by surfactant mixtures. ม.ป.ท.:Chulalongkorn University. 1997. Print.