“…Early research applied co-word analysis on titles or keywords of academic papers. By applying co-word analysis, researchers have revealed the development of concepts (Ronda-Pupo & Guerras-Martin, 2012), a subject (Keupp, Palmié , & Gassmann, 2012), a method (Noyons & van Raan, 1998), or a domain (Baldwin et al, 2003;Blooma et al, 2009;Coulter, Monarch, & Konda, 1998;Jiang et al, 2012;Vala, Lima, & Caetano, 1996;Viedma-Del-Jesus et al, 2011). In addition, co-word analysis is also widely used in finding hot topics (Hu, Liu, & Li, 2013;Peng & Wei, 2012) and hidden topics (Milojević et al, 2011;Muñoz-Leiva et al, 2012).…”