Better title matching

[jastiso]

Background: The extension currently works by grabbing the title of each paper on a search paper, searching for that title in Crossref, and trying to match the current title with the results. This process can be improved by including other information, such as the date, or DOI, in the crossref search.

Action Item: We would like to add code in the content.js file that pulls the date or DOI from each results on PubMed and Google scholar, and includes it in the Crossref query