2Garfield E. Citation Indexes for Science. A New Di- mension in Documentation through Association of Ideas [ J ]. Science. 1955, 122(3159) :108--111.
3Garfield E. Citation Analysis as a Tool in Journal Evaluation. Journals can be Ranked by Frequency and Impact of Citations for Science Policy Studies [ J ]. Science, 1972,178 (60) : 471.
