5American Chemistry Society, Chemistry in the Community, copyright 1988 : 1 - 260.
6Peter Doyle, M. L. Lo. Chemistry Today experimental workbook.Published by Lengnmn Asian Limited, Hong Kong Education Division, copyright 1993.
7Raymond E. Davis, PH. D, H. Clark Metcalfe, John E. Wiliams,Josephf. Castlm et al. Modern Chemistry . Holt, Rinehart and Winston, copyright 1999 :12T,27T.
6Law J,Bauin S,Courtial J P,et al. Policy and the Mapping of Scientific Change: A Co-Word Analysis of Research into Environmental Acidification [J].Scientometrics, 1988,14 (3) : 251-264.