Friedman, MRetief, D. H2016-03-012016-03-011973Friedman, M., Retief, D. H. 1973. A clinical and laboratory evaluation of a new composite restorative material. Journal of the dental association of South Africa; 28(8):460-6http://hdl.handle.net/10539/19872PKenComposite Resins/standardsArticle