@inproceedings{AFL-2014-BarashO,
	author        = "Mikhail Barash and Alexander Okhotin",
	booktitle     = "{Proceedings of the 14th International Conference on Automata and Formal Languages}",
	doi           = "10.4204/EPTCS.151.6",
	pages         = "94--108",
	series        = "{EPTCS}",
	title         = "{Grammars with two-sided contexts}",
	volume        = 151,
	year          = 2014,
}