| Verfasser | Häufigkeit |
| Blecker, Robert A. |
3 |
| Buchmann, Robert Andrei 1977- |
3 |
| Bush, Robert A. Baruch 1948- |
3 |
| Cohen, Stephen D. |
3 |
| Folger, Joseph P. 1951- |
3 |
| Karagiannis, Dimitris 1956- |
3 |
| Polini, Andrea ca. 20./21. Jh |
3 |
| Baer, Robert Alexander 1994- |
2 |
| Baron, Robert A. 1943- |
2 |
| Barton, Robert A. 1959- |
2 |
| Beattey, Robert A. |
2 |
| Blouin, Robert A. |
2 |
| Bohnke, Robert-Alexander 1927-2004 |
2 |
| DiPiro, Joseph T. |
2 |
| Johansson, Björn |
2 |
| Johansson, Björn 1963- |
2 |
| McNamara, Patrick 1956- |
2 |
| Nunn, Charles L. |
2 |
| Paulus, Paul B. |
2 |
| Pirelli, Gianni |
2 |