It is still an open issue which vectorspace projections yield the semantically best clusters (Hill, Cho & Korhonen, 2016) and further experiments are needed.
for storyline (Rissen et al., 2013) clustering the signals for the stories belonging to the same storyline might be not so much the semantic similarity of the articles (they might report various developments of the storyline from differing viewpoints), but rather the matching time and location as well as same organizations and people being involved -the information typically supplied by Named Entity Linking (NEL) tools.