Carol Tenopir, Lisa Christian, and Jordan Kaufman have published "Seeking, Reading, and Use of Scholarly Articles: An International Study of Perceptions and Behavior of Researchers" in Publications.
Here's an excerpt:
While journal articles are still considered the most important sources of scholarly reading, libraries may no longer have a monopoly on providing discovery and access. Many other sources of scholarly information are available to readers. This international study examines how researchers discover, read, and use scholarly literature for their work. Respondents in 2018 report an average of almost 20 article readings a month and there are still significant differences found in the reading and use of scholarly literature by discipline and geographical location, consistent with the earlier studies. Researchers show they are willing to change or adopt new strategies to discover and obtain articles.
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