1. Discourse structure and human knowledge;Chafe,1972
2. Givenness, contrastiveness, definiteness, subjects, topics and point of view;Chafe,1976
3. Pragmatics;Gazdar,1979
4. Notes on transitivity and theme in English;Halliday;Journal of Linguistics,1967
5. Focus of attention and the choice of pronouns in discourse;Linde,1979