Several techniques have been proposed to deal with these ambiguity cases (Tanaka and Umemura, 1994;Shirai and Yamamoto, 2001;Bond et al., 2001;Paik et al., 2004;Kaji et al., 2008;Shezaf and Rappoport, 2010).
each technique has different performance and properties producing dictionaries of certain characteristics, such as different levels of coverage of entries and/or translations.