As leis do comércio electrónico : regime jurídico da assinatura digital e da factura electrónica / Manuel Lopes Rocha ...[et.al.]
Digital signatures : a survey of law and practice in the European Union / European Commission
Leis do comércio electrónico : notas e comentários / Manuel Lopes Rocha ...[et.al.]
Shaping the digital transformation in Europe [documento eletrónico] / European Commission