A constrained graph algebra for semantic parsing with AMRs Jonas Groschwitz author Meaghan Fowlie author Mark Johnson author Alexander Koller author 2017 text Proceedings of the 12th International Conference on Computational Semantics (IWCS) — Long papers Claire Gardent editor Christian Retoré editor conference publication groschwitz-etal-2017-constrained https://aclanthology.org/W17-6810/ 2017