@inproceedings{semanticdependencygraphparsingusingtree,
  title = {Semantic Dependency Graph Parsing Using Tree Approximations},
  author = {{\v{Z}}eljko Agi{\'c} and Alex Koller and er and Stephan Oepen},
  year = {2015},
  booktitle = {WS 2015 4},
  url = {https://aclanthology.org/W15-0126},
}