@inproceedings{CADE-2007-HeilalaP,
	author        = "Samuli Heilala and Brigitte Pientka",
	booktitle     = "{Proceedings of the 21st International Conference on Automated Deduction}",
	doi           = "10.1007/978-3-540-73595-3_9",
	isbn          = "978-3-540-73594-6",
	pages         = "116--131",
	publisher     = "{Springer International Publishing}",
	series        = "{Lecture Notes in Computer Science}",
	title         = "{Bidirectional Decision Procedures for the Intuitionistic Propositional Modal Logic IS4}",
	volume        = 4603,
	year          = 2007,
}