| |
| 1990 | ||
|---|---|---|
| 2 | EE | Holger Bürk, Andreas Pfitzmann: Value exchange systems enabling security and unobservability. Computers & Security 9(8): 715-721 (1990) |
| 1989 | ||
| 1 | EE | Holger Bürk, Andreas Pfitzmann: Digital payment systems enabling security and unobservability. Computers & Security 8(5): 399-416 (1989) |
| 1 | Andreas Pfitzmann | [1] [2] |