1. Clinical measurement, artifact, and data analysis in dioptric power space.;Harris;Optom Vis Sci,2001
2. Error cells in spherocylindrical pseudospace: noninvariance under spherocylindrical transposition.;Harris;S Afr Optom,2002
3. Error cells for spherical powers in symmetric dioptric power space.;Harris;Optom Vis Sci,2005
4. Practical Physics. 3rd ed.;Squires,1985
5. Clinical measurement of refraction, vector h and exact analysis of errors.;Harris;S Afr Optom,2001