“…Corpus-based research of academic and professional discourse has revealed the pervasiveness of collocation in this type of discourse (Biber, 2006;Biber et al, 1999Biber et al, , 2004Cortés, 2004;Coxhead, 2008;Gledhill, 2000, Luzón, 2000, Ward, 2007 and has thrown some light on the nature of academic phraseology. Some researchers have focused on extended collocations that frequently co-occur in a register, referred to as "lexical bundles" (Biber et al, 1999;Cortés, 2004) or "clusters" (Hyland, 2008), e.g.…”