| Verfasser | Häufigkeit |
| Coops, Cees |
5 |
| Coops, Cees M. |
5 |
| Coops, Johan Adriaan Herman |
3 |
| Dufourcq, Jean 1948- |
3 |
| Coops, Helen L. |
2 |
| Coops, Jan |
2 |
| Faber, Peter 1952- |
2 |
| Monaghan, Andrew 1974- |
2 |
| Boonstra, Jos |
1 |
| Ciascai, Gheorghe |
1 |
| Coops, Francis W. |
1 |
| Coops, G. H. |
1 |
| Coops, Gerard M. |
1 |
| Coops, Hugo |
1 |
| Coops, Theodor J. |
1 |
| Dufourcq, Jean |
1 |
| Faber, Peter |
1 |
| Loup, Laure Borgomano- |
1 |
| Monaghan, Andrew |
1 |
| Ponsard, Lionel |
1 |