What's the most cited research published in the 21st century?
Which are the most cited papers of all time?
And what decades-old science studies are still heavily referenced today?
Answers to all these and more in a series of features in Nature on the research that makes the top of the citation charts.
(Long-time readers will remember a 'top 100 papers' that Nature ran in 2014 -- as part of this package this is updated to the present day)
