Rohan Choudhary Sameep Mehta Amitabha Bagchi Rahul Balakrishnan Towards Characterization of Actor Evolution and Interactions in News Corpora. 422-429 2008 ECIR http://dx.doi.org/10.1007/978-3-540-78646-7_39 conf/ecir/2008 db/conf/ecir/ecir2008.html#ChoudharyMBB08