1. 1. Simonson E, Enzer N:Measurement of fusion frequency of flicker as a test for fatigue of the central nervous system. Indust Hyg Toxicol. 23, pp.83-89, 1941.
2. 2. Karwowski W:International Encyclopedia of Ergonomics and Human Factors, 2nd Edition, CRC Press, 2006.
3. 3. Hecht S, Verrijp CD:The influence of intensity, color and retinal location on the fusion frequency of intermittent illumination. Proc Natl Acad Sci USA. 19, pp.522-535, 1993.
4. 4. Hecht S, Verrijp CD:Intermittent stimulation by light:IV. A theoretical interpretation of the quantitative data of flicker. J General Physiol. 17, pp.269-282, 1993.
5. 5. Grant S, Aitchison T, Henderson E, Christie J, Zare S, McMurray J, Dargie H:A comparison of the reproducibility and the sensitivity to change of visual analogue scales, Borg scales, and Likert scales in normal subjects during submaximal exercise. Chest. 116, pp.1208-1217, 1999.