Melatonin and tryptophan as therapeutic agents against the impairment of the sleep-wake cycle
Paredes, S.D., et al. (December 2007) Melatonin and tryptophan as therapeutic agents against the impairment of the sleep-wake cycle and immunosenescence due to aging in Streptopelia risoria. Neuro Endocrinology Letters, 28, 757-60.