@inproceedings{DLT-1995-Jedrzejowicz,
	author        = "Joanna Jedrzejowicz",
	booktitle     = "{Proceedings of the Second International Conference on Developments in Language Theory: At the Crossroads of Mathematics, Computer Science and Biology}",
	isbn          = "981-02-2682-9",
	pages         = "112--118",
	publisher     = "{World Scientific}",
	title         = "{An Undecidable Problem for Shuffle Languages}",
	year          = 1995,
}