<cite>Koppel and Ordan (2011)</cite> have built a classifier that can identify the correct source of the translated text (given different possible source languages). They have built another classifier which can identify source text and translated text. Furthermore, they have shown that the degree of difference between two translated texts, translated from two different languages into the same target language reflects, the degree of difference of the source languages. They have gained impressive results for both of the tasks. However, the limitation of this study is that they only used a corpus of English original text and English text translated from various European languages.