Magnitude estimation: issues and practical applications.

@article{Sennottmiller1988MagnitudeEI,
  title={Magnitude estimation: issues and practical applications.},
  author={L Sennott-miller and Carolyn L Murdaugh and Ada Sue Hinshaw},
  journal={Western journal of nursing research},
  year={1988},
  volume={10 4},
  pages={414-24}
}