![](https://media.springernature.com/w90/springer-static/cover/journal/11760/5/4.jpg?as=webp)
Volume 5, Issue 4
November 2011Special section: Unconstrained biometrics: advances and trends
- Issue Editors:
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- Hugo Proença,
- Eliza Yingzi Du,
- Jacob Scharcanski
13 articles in this issue