| 1990 | - | Language and Species - Bickerton | :: | 74 |
| 1997 | - | The Major Transitions in Evolution - Maynard-Smith,Szathmary | :: | 44 |
| 2004 | - | Patterns in syntactic dependency networks - Ferrer-i-Cancho,Sole | :: | 8 |
| 2005 | - | The consequences of Zipf's law for syntax and symbolic reference - Ferrer-i-Cancho,Riordan,Bollobas | :: | 6 |
| 1949 | - | Human Behaviour and the Principle of Least Effort - Zipf | :: | 4 |