1. Two-year clinical study of composites in posterior teeth (Special Issue) (Abstract no. 952);Heymann;J Dent Res,1984
2. Five year clinical study of composite resins in posterior teeth (Special Issue) (Abstract no. 480);Heymann;J Dent Res,1987
3. Two year clinical study of composite resins in posterior teeth;Heymann;Dent Mat,1986