1. Symbol and structure: a comprehensive framework for language evolution;Bickerton,2003
2. Some facts about primate (including human) communication and social learning;Tomasello,2002
3. The role of sequential learning in language evolution: computational and experimental studies;Christiansen,2002
4. Introduction: conceptualizing transition in an evolving field;Wray,2002
5. The faculty of language: what is it, who has it, and how did it evolve?;Hauser;Science,2002