| Verfasser | Häufigkeit |
|---|---|
| Bynum, Michael L. | 2 |
| Hackebeil, Gabriel A. | 2 |
| Hart, William E. | 2 |
| Laird, Carl D. | 2 |
| Nicholson, Bethany L. | 2 |
| Siirola, John D. | 2 |
| Watson, Jean-Paul | 2 |
| Woodruff, David L. | 2 |
| Brockman, Diane K. | 1 |
| Hoven, Jeroen van den | 1 |
| Schaik, Carel van | 1 |
| Weckert, John | 1 |