@proceedings {664394,
	title = {Pricing via processing or combatting junk mail},
	journal = {Advances in Cryptology: CRYPTO 1992},
	year = {1992},
	pages = {139-147},
	publisher = {Annual International Cryptography Conference},
	url = {http://www.wisdom.weizmann.ac.il/~naor/PAPERS/pvp.pdf},
	author = {Dwork, C. and Naor, M.}
}
