@inproceedings {5011,
	title = {First-Order Queries Over Temporal Databases Inexpressible in Temporal Logic},
	booktitle = {International Conference on Extending Database Technology (EDBT)},
	year = {1996},
	doi = {10.1007/BFb0014160},
	author = {David Toman and Damian Niwinski}
}
