1–2 von 2 Ergebnissen
|

    Nonstandard diffraction structures for OVDs [3314-20]

    Staub, R. / Tompkin, W. R. / SPIE | British Library Conference Proceedings | 1998
    Schlagwörter: counterfeit deterrence techniques

    Machine-verifiable diffractive features for document security [3314-21]

    Tompkin, W. R. / Staub, R. / SPIE | British Library Conference Proceedings | 1998
    Schlagwörter: counterfeit deterrence techniques