PaperLabHow do you map the literature on a research topic?
Start from a few papers you know are central, then follow their citations both ways: the older papers they cite and the newer papers citing them. Papers that are often cited together (co-citation) or that cite the same sources (bibliographic coupling) belong to the same conversation. A citation graph draws this as a network, where clusters show sub-topics and heavily linked papers show the foundations.
By Malek Khannoussi · Updated25 September 2026
The four links that matter
| Link | What it tells you |
|---|---|
| Backward citation | What a paper builds on: its foundations |
| Forward citation | Who built on it since: where the field went |
| Co-citation | Papers the field reads together |
| Bibliographic coupling | Recent papers working on the same problem |
A mapping routine
- Pick three to five seed papers.
- Collect their references and the papers citing them.
- Keep papers that several seeds point to: they're central.
- Look at clusters, and name each one in a sentence.
- Read one or two papers per cluster before going deeper.
Reading the map
- Big, central nodes are foundations: cite them, don't necessarily read them first.
- Bridges between clusters are often the most interesting papers.
- Recent nodes with few links may be new directions, or noise.
Questions people ask
What is co-citation?
Two papers are co-cited when a third paper cites both. The more often that happens, the more the field treats them as related.
What is bibliographic coupling?
Two papers are coupled when they cite the same sources. It links recent papers well, because it doesn’t need them to have been cited yet.
Which tools draw literature maps?
Connected Papers, ResearchRabbit and Litmaps build maps from online databases, each with its own free and paid limits. PaperLab draws a graph of the papers already in your library, on your machine.
How many seed papers should I start with?
Three to five strong, well-cited papers usually give a stable map. Too few and the map follows one author’s view; too many and it loses focus.