Reference Resolution beyond Coreference: a Conceptual Frame and its Application Andrei Popescu-Belis author Isabelle Robba author Gerard Sabah author 1998 text COLING 1998 Volume 2: The 17th International Conference on Computational Linguistics conference publication popescu-belis-etal-1998-reference https://aclanthology.org/C98-2167/ 1998