Furthermore, (Blair-Goldensohn, 2007) improved previous work with the use of parameter optimization, topic segmentation and syntactic parsing.
(Sporleder and Lascarides, 2008) showed that the training model built on a synthetic data set, like the work of (Marcu and Echihabi, 2002), may not be a good strategy since the linguistic dissimilarity between explicit and implicit data may hurt the performance of a model on natural data when being trained on synthetic data.