1. Metacontrast;Alpern;J. opt. Soc. Am.,1953
2. Visual perception and the retinal mosaic;Anderson;Am. J. Physiol.,1923
3. Perception of contour orientation in the central fovea—I: Short lines;Andrews;Vision Res.,1967
4. Über die Grenze der Erkennbarkeit von Lagenunterschieden;Best;Albrecht v. Graefes Arch. Ophthal.,1900
5. Probit Analysis;Finney,1952