Influences of citric acid as a chelating reagent on the characteristics of nanophase hydroxyapatite powders fabricated by a sol-gel method
Journal of Materials Science Letters, Volume 21, Number 22 / Ноябрь 2002., 1793-1795
C.L.Chu, P.H.Lin, Y.S.Dong and D.Y.Guo
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http://dx.doi.org/10.1023/A:1020997510289