Natural Language in Four Spatial Interfaces Kenneth Wauchope author Stephanie Everett author Dennis Perzanowski author Elaine Marsh author 1997-03 text Fifth Conference on Applied Natural Language Processing Association for Computational Linguistics Washington, DC, USA conference publication wauchope-etal-1997-natural 10.3115/974557.974559 https://aclanthology.org/A97-1002/ 1997-03 8 11