There are 2 main ways to get citations into MyEndnoteWeb: one is to is to hand-enter them yourself; the other is to import them from one of the research databases.
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Exporting Directly from a Database into MyEndnoteWeb
Exporting to a File and Uploading to EndnoteWeb
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Summon is currently one of those databases.
More Ways to Capture Citations from Specific Databases/Software
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