![](https://media.springernature.com/w90/springer-static/cover/journal/181/60/6.jpg?as=webp)
Volume 60, Issue 6
June 2021Special Issue on Productivity and Efficiency
- Issue Editors:
-
- Subal C. Kumbhakar,
- Emir Malikov,
- Christopher F. Parmeter
19 articles in this issue