@article {Boxer:January 2005:0924-9907:19,
	author = "Boxer Laurence",
	title = "Properties of Digital Homotopy",
	journal = "Journal of Mathematical Imaging and Vision",
	volume = "22",
	year = "January 2005",
	abstract = "Several recent papers have adapted notions of geometric topology to the emerging field of ‘digital topology.’ An important notion is that of digital homotopy. In this paper, we study a variety of digitally-continuous functions that preserve homotopy types or homotopy-related properties such as the digital fundamental group.",
	pages = "19-26(8)",
	url = "http://www.ingentaconnect.com/content/klu/jmiv/2005/00000022/00000001/00004780"
	doi = "doi:10.1007/s10851-005-4780-y"
}