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The phrase "fewer studies" is correct and usable in written English.
You can use it when you want to compare two or more groups of studies in terms of their number. For example, "In recent years, fewer studies have been conducted on the economic benefits of renewable energy sources than on fossil fuels."
Exact(60)
For BSL, however, there are far fewer studies available.
Even fewer studies use a naturally ventilated atrium.
One of the physicians assessed far fewer studies as 'equivocal' than the other two.
The relationship between estrogens fluctuations and MA has been the focus of fewer studies.
Even fewer studies provide a chronosequence to depict change in carbon storage among compartments through time.
There have been far fewer studies of terminator effects on Pi pulsations than on Pc pulsations.
Further, fewer studies tried to select representative metrics from the numerous metrics for LST indication.
Even fewer studies have studied them within the context of cerclage surgery.
However, fewer studies have investigated the effect of glucose on memory in children or adolescents.
Even fewer studies have investigated the toxicologic pathology of the products of nanotechnology.
Far fewer studies have examined hippocampal shape.
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Since I tried Ludwig back in 2017, I have been constantly using it in both editing and translation. Ever since, I suggest it to my translators at ProSciEditing.

Justyna Jupowicz-Kozak
CEO of Professional Science Editing for Scientists @ prosciediting.com