They use, for example, a relatively coarse-grained notion of semantic compatibility between a few high-level concepts in WordNet (Soon, Ng, and Lim 2001), or more detailed hyponymy and synonymy links between anaphor and antecedent head nouns (Vieira and Poesio 2000;Harabagiu, Bunescu, and Maiorano 2001;Ng and Cardie 2002b, among others).
several researchers have pointed out that the incorporated information is still insufficient.