| Verfasser | Häufigkeit |
| Geffken, Rolf 1949-2023 |
41 |
| Geffken, Michael |
7 |
| Geffken, Heinrich |
3 |
| Geffken, Lennart |
3 |
| Breu, Simon 1858-1933 |
2 |
| Cui, Can |
2 |
| Geffken, Detlef |
2 |
| Geffken, Katrin |
2 |
| Geffken, Ursula 1946- |
2 |
| Kalka, Jochen 1964- |
2 |
| Zillich, Martin |
2 |
| Althaus, Marco 1971- |
1 |
| Bachfischer, Nikola |
1 |
| Busch, Rosemarie |
1 |
| Dammann, Klaus |
1 |
| GEffken, Michael |
1 |
| Geffken, Anna C. |
1 |
| Geffken, Bernd Peter |
1 |
| Geffken, Friedrich H. |
1 |
| Geffken, Johannes |
1 |