Heinz Martens

Suppression of melatonin secretion in some blind patients by exposure to bright light.

J. Rizzo, D. Brotman, C. Czeisler, 1995, The New England journal of medicine.

Circadian sleep regulation in the absence of light perception: chronic non-24-hour circadian rhythm sleep disorder in a blind man with a regular 24-hour sleep-wake schedule.

R. Kronauer, D. Dijk, C. Czeisler, 1993, Sleep.