Here are some good candidates:
- Inner Source—Adopting Open Source Development Practices in Organizations
- Adopting InnerSource: Principles and Case Studies
- Application of inner source on small development teams - A case study
- Dirk Riehle: "Ten Years of Inner Source: Case Studies & Conclusions"
- A comparative study of challenges in integrating Open Source Software and Inner Source Software
- Case studies of Inner Source
- Promoting Software Reuse in a Corporate Setting