PEDERSEN, T. P. Electronic Payments of Small Amounts. DAIMI Report Series, [S. l.], v. 24, n. 495, 1995. DOI: 10.7146/dpb.v24i495.7023. Disponível em: https://tidsskrift.dk/daimipb/article/view/7023. Acesso em: 9 may. 2024.