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Enlaces

http://www.iec.csic.es/criptonomicon/articulos/expertos30.html

http://www.teleley.com/articulos/art_pago_electronico.pdf

http://www.marketingencasa.com/pago-electronico.html

http://www.dat.etsit.upm.es/~mmonjas/pago/index.html

http://foroconsumo.cepymev.es/ce/pago.htm