According to Nguyen et al. (2015)
"In the last decade, the relation extraction litera- ture has been dominated by two methods, distin- guished by the nature of the relation representa- tion: the feature-based method (Kambhatla, 2004; Boschee et al., 2005; Zhou et al., 2005; Grishman et al., 2005; Jiang and Zhai, 2007; Chan and Roth, 2010; Sun et al., 2011; Nguyen and Grishman, 2014) and the kernel-based method (Zelenko et al., 2003; Culotta and Sorensen, 2004; Bunescu and Mooney, 2005a; Bunescu and Mooney, 2005b; Zhang et al., 2006; Zhou et al., 2007; Qian et al., 2008; Nguyen et al., 2009; Sun and Han, 2014)."
- Nguyen, T. H., & Grishman, R. (2015). Relation Extraction : Perspective from Convolutional Neural Networks, 39–48.