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The phrase "Several research studies" is correct and usable in written English
It can be used to refer to a number of research studies done on a specific topic. For example: "Several research studies have found that exercise is beneficial to physical and mental health."
Exact(60)
Several research studies on incubators have been defined.
Several research studies have been published on CO2 pipeline transportation.
Several research studies have been conducted over the last decade, proposing cost-efficient broadband architectures.
Several research studies have been reported dealing with the effect of connection behaviour on steel frames.
Several research studies have focused on routing protocols of ad hoc networks[1 5].
Several research studies have examined this issue from an engineer's perspective.
Several research studies were conducted and focused on the performance of PFRP beams, columns and frame structures.
Several research studies have focused on load balancing across processors or computers in both non-virtualized [6] and virtualized environments [7].
Several research studies developed over the past 15 years reported the evidence of NSAIDs-induced kidney dysfunctions, such as acute renal failure and electrolyte imbalance.
Several research studies have used accelerated corrosion tests to study the corrosion resistance of reinforced concrete structural members incorporated new materials and/or designs.
Several research studies have been conducted in the past on the accuracy of AADT estimates resulting from short-period traffic counts during the spring and summer months.
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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