2Swinkels JWGM, Komegay E'T, Verstegen MWA . Biology of zinc and biological value of dietary organic zinc complexes and chelates[J]. Nutr Res Rev, 1994, 7: 129-149.
3Flanagan PR. A model to produce pure zinc deficiency in rats and its use to demonstrate that dietary phytate increase the excretion of endogenous zinc[J]. J Nutr . 1984 , 114: 493-502.