It is closely related to the task of coreference resolution (Van Deemter and Kibble, 2000), for which a myriad of solutions have been proposed (Clark and Manning, 2015;Peng et al., 2015;Wiseman et al., 2015;Björkelund and Farkas, 2012;Lee et al., 2011;Stoyanov et al., 2010;Ng, 2008;Bergsma and Lin, 2006;Soon et al., 2001).
it represents a form of negation of group membership (e.g.