@inproceedings{Ramshaw91,
  title = {A Three-Level Model for Plan Exploration},
  author = {Lance A. Ramshaw},
  year = {1991},
  tags = {meta-model, Meta-Environment},
  researchr = {https://researchr.org/publication/Ramshaw91},
  cites = {0},
  citedby = {0},
  pages = {39-46},
  booktitle = {ACL},
}