Feature-Rich Named Entity Recognition for Bulgarian Using Conditional Random Fields Georgi Georgiev author Preslav Nakov author Kuzman Ganchev author Petya Osenova author Kiril Simov author 2009-09 text Proceedings of the International Conference RANLP-2009 Galia Angelova editor Ruslan Mitkov editor Association for Computational Linguistics Borovets, Bulgaria conference publication georgiev-etal-2009-feature https://aclanthology.org/R09-1022/ 2009-09 113 117