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1.You can select the time range and periodical catalogue when you search periodicals. If you do not select the range and catalogue, then it will search as default.
2.When you search, you need to input words which is you want to serch. The words may appear in name of periodical, title of articles, name of author, unit of author, key words and abstract.
3.You can input several search words which relation may be restricted by "and" ( words appear at same time) or by "or" (words appears one of them).Note: If you select the name of periodical,which relations with other conditions is only "and".


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