8Maddocks S A, Cuthill I C, Goldsmith A R, Sherwin C M.Behavioural and physiological effects of absence of ultraviolet wavelengths for domestic chicks. Anamal Behaviour, 2001, 62:1013-1019.
9Slominski A, Pawelek J. Animals under the sun: Efects of ultraviolet radiation on mammalian skin. Clinics in Dermatology. 1998, 16:503-515.
10Tanimoto H, Lau K H, Nishimoto S K, Wergedal J E, Baylink D J.Evaluation of the usefulness of serum phosphatases and osteocalcinas serum markers in a calcium depletion-repletion rat mode. Calcified Tissue International, 1991,48:101.