Yoshiyuki Sakamoto Tetsuya Ishikawa Masayuki Satoh Concept and Structure of Semantic Markers for Machine Translation in Mu-Project. 13-19 1986 conf/coling/1986 COLING db/conf/coling/coling1986.html#SakamotoIS86 http://aclweb.org/anthology/C/C86/C86-1003.pdf