When I copy a reference and paste it back in somewhere else, the reference list creates a new bullet list in the reference list, despite the reference already being there. This can quickly clutter the reference list, especially if placed more in the middle of an edited article.
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You mean when you don't copy it from the existing document (in edit mode), but from read mode, or a different article, correct ?
What I mean is that if I copy a reference from another page and if I were to add it more then one time it creates two different references with the same content.
Here's a screenshot of how it looks. https://imgur.com/a/2BxuwXU