    @article {1712,
	title = {Sistemas Electr{\'o}nicos de Micropago},
	journal = {Revista de Contrataci{\'o}n Electr{\'o}nica},
	volume = {22},
	year = {2001},
	pages = {3-22},
	issn = {1576-2033},
	author = {Jorge Davila and Javier Lopez}
}
