| 2007 | - | Semiotic dynamics and collaborative tagging - Cattuto,Loreto,Pietronero | :: | 5 |
| 2005 | - | The emergence and evolution of linguistic structure: from lexical to grammatical communication systems - Steels | :: | 12 |
| 1984 | - | The Evolution of Cooperation - Axelrod | :: | 21 |