The retrieval algorithm used by commercial TM systems is typically not disclosed (Koehn and Senellart, 2010;Simard and Fujita, 2012;Whyman and Somers, 1999).
the bestperforming method used in current systems is widely believed to be based on edit distance (Baldwin and Tanaka, 2000;Simard and Fujita, 2012;Whyman and Somers, 1999;Koehn and Senellart, 2010;Christensen and Schjoldager, 2010;Mandreoli et al., 2006;He et al., 2010).