1. Variation in stereoscopic acuity with observation distance;Amigo;J. Opt. Soc. Am.,1963
2. Stereoscopic-acuity and observation distance;Brown;Invest. Ophthal.,1965
3. Clinical stereopsis testing: contour and random dot stereograms;Cooper;J. Am. optom. Ass.,1979
4. Comparing stereoscopic performance of children using Titmus, TNO and Randot stereotests;Cooper;J. Am. Optom. Ass.,1979
5. Brain damage and global stereopsis;Cowey;Proc. R. Soc. B.,1979