R. F. · R. S. · Roger Frantz · Roger S.
| title | ISBN-13 (ISBN-10) | year of publication |
|---|---|---|
| X-Efficiency: Theory, Evidence and Applications | 978-0-7923-9768-7 (0-7923-9768-1) | 1997 |
| X-Efficiency: Theory, Evidence and Applications | 978-0-89838-242-6 (0-89838-242-4) | 1988 |