1. A new method for matching tooth colors with color standards;Burgt;J Dent Res,1985
2. Tooth discoloration induced by endodontic sealers;Burgt;J Dent Res,1985
3. Method for inducing reproducible intrinsic discolouration in extracted human teeth;Burgt;Int Endod J Accepted for publication,1985
4. Pathways of the pulp;Cohen,1984
5. Official recommendations on uniform colour spaces, colour difference equations and metric colour terms;Commission Internationale de l'Eclairage;Colormetry (E-1.3.1),1971