Importance of factorial designs in testing abrasion by dentifrices.

@article{Manly1967ImportanceOF,
  title={Importance of factorial designs in testing abrasion by dentifrices.},
  author={R S Manly and David H. Foster},
  journal={Journal of dental research},
  year={1967},
  volume={46 2},
  pages={442-5}
}