"case studies undertaken" is correct and usable in wrote English.
You can use it when talking about research studies that have been conducted in order to gain a better understanding of a particular subject. For example: "We have conducted several case studies undertaken in order to better understand the impacts of climate change in coastal areas."
Volume two, Natural Disaster Hotspots Case Studies, published in 2006, presents a series of case studies undertaken to support the global analysis.
This paper presents the results from two case studies undertaken independently in Budapest, Hungary and Spring Mill Pioneer Village, Indiana, USA.
Going even further back, case studies undertaken in 2011 by energy consultant Diane Hubbard found that most of the houses built before 1900 were more airtight than expected, and in some cases better than required by the 2006 building regulations, and "modern extensions may not be as airtight as the original building".
A subsequent section reviews the findings of eight selected case studies, undertaken under the auspices of the WIDER project.
Second, historical case studies undertaken by members of the Edinburgh school attempt to show that scientists are heavily influenced by social factors "external" to the proper business of science.
Yet views vary on whether we can synthesise research from multiple case studies undertaken independently.
Some of the country case studies undertook a policy analysis, but all pointed to some health financing policy context, process or actors' issues.
This paper reports a case study undertaken to test the sensemaking tools developed by the Scholarly Ontologies project.
Lastly, a case study undertaken in Chifeng in northern China demonstrates how these solutions act in a first-ever DH demonstration project using multiple sources of waste heat from a copper smelter.
Through a case study undertaken at King Mongkut's University of Technology Thonburi, this chapter explores how student feedback in engineering programmes in Thailand can enhance the quality of student learning outcomes.
IT/IS performance in hospitals is evaluated using a designed questionnaire, along with a case study undertaken to discuss IT/IS assessment and the effect of IT/IS on hospital procedures.
