Citrus

Finding the papers closest to one you already know is the job Citrus does. Citrus is a similarity-based search engine for scientific literature: you pick a paper, start the search, and land in the middle of that research area without writing keyword queries.

Results run from seminal papers to the state of the art, and a timeline view lets you see important contributions at a glance.

You can also browse with different taxonomy so fewer relevant papers slip past you.

Under the hood, Citrus scores how similar papers are using graph-based and text-based machine learning.

The index comes from Semantic Scholar's Open Research Corpus, which covers over 200 million publications and around 2 billion citations.

That makes it a handy starting point for a literature review in an unfamiliar field.