| Author | Popularity |
| Alnemari, Reem M. |
2 |
| Alpar, Paul (Prof. Dr.) |
2 |
| Altegoer, Florian |
2 |
| Ambreen, Ghazala |
2 |
| Amin, Muhammad Umair |
2 |
| Ammoneit, Rieke |
2 |
| Anders, Ivonne |
2 |
| Andreae, Johann Ernst |
2 |
| Andreae, Samuel |
2 |
| Antes, Peter |
2 |
| Aristoteles |
2 |
| Arndorff, Johann Heinrich |
2 |
| Arndt, Friedrich |
2 |
| Arnold, Rudolf (Prof. Dr.) |
2 |
| Arnoldus de Villa Nova |
2 |
| Arrhenius, Svante |
2 |
| Asbrock, Frank |
2 |
| Asef, Esther Marie |
2 |
| Ast, Julia |
2 |
| Auener, Helmut |
2 |