6Berger A L,Pietra S A D,Pietra V J D.A maximum entropy approach to natural language processing[J].Computational Lin-guistics,1996,22(1).
7Kiyotaka U,Ma Qing.Named entity extraction based on a maximum entropy model and transformation rules[C] //Pro-ceedings of the38th Annual Meeting on Association for Computational Linguistics.Hong Kong:[s.n.] ,2000:326-335.