1. Gobierno de España. Real Decreto-Ley 14/1999, de 17 de septiembre, sobre firma electrónica. http://www.sgc.mfom.es/legisla/internet/rdley14_99.htm
2. Freudenthal, M.; Heiberg, S., Willemson, J.: Personal Security Environment on Palm PDA. Pertenecientea: Ann ual Computer Security Applications Conference, Sheraton New Orleans, Louisiana USA.
3. Daswani, N., Boneh, D.: Exp erimenting with Electronic Commerce on the PalmPilot. http://www.stanford.edu/~dabo
4. Ang, K. M., Caelli, W. J.: Certificate based PKI and B2B e-commerce: suitable match or not?. Proceedings of the 16th International Conference on Information Security (IFIP/SEC 2001). Kluwer Academic Publishers. (2001)
5. Rivest, R. L., Shamir, A., Adleman, L.: A method for obtaining digital signatures and public key cryptosystems. Communications of the ACM 21(2):120–126. (1978)