@article{LDTA-2009-AllwoodE10,
	author        = "Tristan O. R. Allwood and Susan Eisenbach",
	doi           = "10.1016/j.entcs.2010.08.028",
	journal       = "{Electronic Notes in Theoretical Computer Science}",
	number        = 7,
	pages         = "3--18",
	title         = "{Strengthening the Zipper}",
	volume        = 253,
	year          = 2010,
}