TY  - RPRT
TI  - Classification of toothbrush stiffness by a dynamic method.
AU  - J R Heath
AU  - H J Wilson
PY  - 1971
DO  - 10.1038/sj.bdj.4802627
UR  - https://pubmed.ncbi.nlm.nih.gov/5278907/
ID  - 5278907
ER  -