search query: @keyword electronic payment systems / total: 3
references: 1-3 / 3
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| title | year | author | ||
| 1. | 2008 | Plathan, Antti |
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| 2. | 2002 | Lehtonen, Tero Tapani |
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| 3. | 2001 | Salminen, Jari |
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