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Ivanova, A.; Oepen, S.; Dridan, R.; Flickinger, D.; Øvrelid, L.; Lapponi, E. On Different Approaches to Syntactic Analysis into Bi-Lexical Dependencies: An Empirical Comparison of Direct, PCFG-Based, and HPSG-Based Parsers. JLM 2016, 4, 113–144.