An article I contributed to just went online a few days ago. Here is the full reference (also added to the publications page):
Brown P, RELISH Consortium & Zhou Y (2019) Large expert-curated database for benchmarking document similarity detection in biomedical literature search. Database 2019: baz085. doi:10.1093/database/baz085
This article describes a search engine and database of research articles linked by their similarity. My contribution was to use the search engine and manually annotate the results to record whether the articles returned were relevant to the initial article used to start the search process. In addition of earning me authorship on this article, using this search engine was also very helpful while writing a review.