Yuichi Nakamura Tsukasa Hirashima Kuniaki Uehara Jun'ichi Toyoda Providing explanation capability based on individual understanding and domain principles. 991-1000 1989 IEA/AIE (2) http://doi.acm.org/10.1145/67312.67374 db/conf/ieaaie/ieaaie1989-2.html#NakamuraHUT89