@inproceedings{conf/sofsem/KlonowskiS08,
	title = {Proofs of Communication and Its Application for Fighting Spam.},
	author = {Marek Klonowski and Tomasz Struminski},
	booktitle = {SOFSEM},
	crossref = {conf/sofsem/2008},
	editor = {Viliam Geffert and Juhani Karhumäki and Alberto Bertoni and Bart Preneel and Pavol Návrat and Mária Bieliková},
	pages = {720-730},
	publisher = {Springer},
	series = {Lecture Notes in Computer Science},
	url = {http://dblp.uni-trier.de/db/conf/sofsem/sofsem2008.html#KlonowskiS08},
	volume = {4910},
	year = {2008},
	biburl = {http://www.bibsonomy.org/bibtex/26ba2d22976714b264cafce4703641b63/dblp},
	description = {dblp},
	ee = {http://dx.doi.org/10.1007/978-3-540-77566-9_62}, isbn = {978-3-540-77565-2}, date = {2008-01-09},
	keywords = {dblp }
}