‘While’ and ‘Until’ Clauses and Expletive Negation in a Corpus of Bulgarian and Ukrainian Parallel Texts Ivan Derzhanski author Olena Siruk author 2016-09 text Proceedings of the Second International Conference on Computational Linguistics in Bulgaria (CLIB 2016) Department of Computational Linguistics, Institute for Bulgarian Language, Bulgarian Academy of Sciences Sofia, Bulgaria conference publication derzhanski-siruk-2016-clauses https://aclanthology.org/2016.clib-1.2/ 2016-09 11 18