1. A guide to pachymeters;Thornton;Ophthalmic Surg.,1984
2. A guide to ultrasonic pachymeters;Thornton;J. Cataract Refract. Surg.,1986
3. Evaluation and comparison of sources of variability in the measurement of corneal thickness with ultrasonic and optical pachymeters;Salz;Ophthalmic Surg.,1983
4. Validity of optical pachymetry measurements made with contact lenses in situ;Snyder;Am. J. Optom. Physiol. Opt.,1987
5. The Design and Analysis of Clinical Experiments;Fleiss,1986