Quantitative evaluation of machine translation using two-way MT. - Shoichi Yokoyama; Akira Kumano; Masaki Matsudaira; Yoshiko Shirokizawa; Mutsumi Kawagoe; Shuji Kodama; Hideki Kashioka; Terumasa Ehara; Shinichiro Miyazawa; Yasuo Nakajima (MTSummit, 1999)