@inproceedings{708,
  author = {David Toman and Damian Niwinski},
  title = {First-Order Queries Over Temporal Databases Inexpressible in Temporal Logic},
  year = {1996},
  journal = {First-Order Queries Over Temporal Databases Inexpressible in Temporal Logic},
  doi = {10.1007/BFb0014160},
}