have citations/cited by appear at cluster level record
The Citation Trail feature is great, but I'm afraid many users will miss it because they click on an item in search results that is a merge record for a "FRBR" cluster of articles from different sources. The citation/cited by doesn't apear on those. Since the user can get to the resources from the Online tab in this record, they are not likely to click on View All Versions. This is such a cool feature it's a shame to miss it, and it's the article that gets cited, not a particular aggregator's version of it.