Beermann, Dorothee & Hellan, Lars. 2004. A treatment of directionals in two implemented HPSG grammars. Proceedings of the 11th International Conference on Head-Driven Phrase Structure Grammar 357–377. (doi:10.21248/hpsg.2004.20) (https://proceedings.hpsg.xyz/article/view/597) (Accessed December 27, 2024.)