CHIZU — the atlas of coffee research
Coffee research in Sweden
Two limits come with this count. Only 100,474 of the 190,643 searchable papers (52.7%) carry an author affiliation country. The other 90,169 (47.3%) carry none. So these 1,075 papers are 1,075 out of the 100,474 whose affiliation is known. And a co-authored paper is counted once for every country its authors sit in. Per-country counts therefore do not add up to the whole.
Sweden does not grow coffee, but coffee is researched there.
Check it yourself
This is not our word for it. You can run the same query against the same index.
When they were written
1939–2026
Years before 1600 are treated as unknown. The upstream data (OpenAlex) sometimes writes 1400 when the year is missing, and that is a placeholder, not a measurement.
Where they appeared
Top 8 sources (journals and repositories)
Most cited
10 papers, most cited first
- Actions of Caffeine in the Brain with Special Reference to Factors That Contribute to Its Widespread Use1999cited 2,618
- Epidemiology and etiology of Parkinson’s disease: a review of the evidence2011cited 1,207
- Interactions between genetic, lifestyle and environmental risk factors for multiple sclerosis2016cited 1,185
- Lithium extraction/insertion in LiFePO4: an X-ray diffraction and Mössbauer spectroscopy study2000cited 682
- Tracing the impact of the Andean uplift on Neotropical plant evolution2009cited 658open access
- Adenosine A2A, but not A1, receptors mediate the arousal effect of caffeine2005cited 633
- Risk factors for hip fracture in european women: The MEDOS study1995cited 570
- The source of first-cycle capacity loss in LiFePO42001cited 549
- Food-Related Gastrointestinal Symptoms in the Irritable Bowel Syndrome2001cited 525
- Efficient Inkjet Printing of Graphene2013cited 504
Which stage of coffee
Only 30.2% of the whole index carries a stage label. Of this country's 1,075 papers, 477 carry one. The breakdown below is about those 477 papers only — the rest were never candidates for it.
One paper can carry several labels, so the breakdown adds up to more than that number.
Which field
Only 75.9% of the whole index carries a field label. Of this country's 1,075 papers, 879 carry one. The breakdown below is about those 879 papers only — the rest were never candidates for it.
One paper can carry several labels, so the breakdown adds up to more than that number.
What language
"undetermined" means the upstream record carried no language. We did not guess one.
Knowledge is not evenly spread
Counting only papers whose author affiliation is known, the largest is Indonesia with 22,248. Sweden has 1,075 — a factor of 21.
That gap does not follow where coffee is grown. Research gathers where the means to do research are, not where the coffee is. Making that visible is why CHIZU exists.
Other countries
Indonesia 22,248United States 17,988Brazil 10,857United Kingdom 5,569China 4,887India 3,542Germany 3,185Italy 3,111France 3,072Japan 2,822Colombia 2,489Spain 2,363