Spotty Citation (About the Article)
Look for specific information such as author(s), journal in which the study was published, date of publication, unique words to describe the subject area.
Known Citation (Complete information)
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4) You may be able to find it in a major database IF it belongs to a specific subject area.
Do we have this article by Elliot Campbell? Large historical growth in global terrestrial gross primary production.
It was published in Nature in 2017.