Verification of duplicates should be improved

[oEscal]

This is not so much of a bug but rather a poorly made verification. The issue is the following: when a user adds a new set of papers in the BibTeX format, ReLiS verifies if the new papers are already in the database. However, the way it verifies this is by getting all papers with the Bibtex ID equal to the Bibtex ID of the new papers. Therefore, if we are adding the same papers that are already in the database but with a different BibTeX ID, ReLiS will not notice the duplication. A practical example of when this becomes a problem is when we use more than one search engine because they may create Bibtex IDs differently.

A better way of verifying duplicates would be something similar to what tools, such as Mendeley, do: verify by the DOI. Moreover, for articles that do not have any DOI, we could maybe verify by the title and author.

[esyriani]

Thank you, yes it is better this way. Note that in a future release, we are planning to integrate a much stronger deduplication feature on papers but also many other entities.