| Verfasser | Häufigkeit |
| Portmann, Michel |
9 |
| Portmann, Georges |
3 |
| Claverie, Gilbert |
2 |
| Portmann, Claudine |
2 |
| Friebe, Paul |
1 |
| Grimaldi, Pierre |
1 |
| Guillen, Georges |
1 |
| Jäggi, Susanne 19XX-2014 |
1 |
| Leduc, Paul |
1 |
| Mathar, Hans-Joachim |
1 |
| Michel, Stefan 1967- |
1 |
| Pifko, Clarisse 1951- |
1 |
| Portmann, Christoph |
1 |
| Portmann, Didier |
1 |
| Scheuring, Johannes |
1 |