1. Recommended standard practices for biologic evaluation of dental materials;DADA,1972
2. Methods in the study of biologic responses to endodontic materials;Langeland;Oral Surg,1969
3. Biologic effects of dental materials. Toxicity of root canal filling materials on HeLa cells in vitro;Spangberg;Oral Surg,1973
4. Biological effect of root canal filling materials. Effect in vitro of solubilised root canal filling materials on HeLa cells;Spangberg;Odontol Revy,1969
5. Biological effect of root canal filling materials. Toxic effect in vitro of root canal filling materials on HeLa cells and human skin fibroblasts;Spangberg;Odontol Revy,1969