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Proença, H., Du, E.Y. & Scharcanski, J. Introduction to the special issue on unconstrained biometrics: advances and trends. SIViP 5, 399–400 (2011). https://doi.org/10.1007/s11760-011-0243-7
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DOI: https://doi.org/10.1007/s11760-011-0243-7