@inproceedings{KotsiaZafeiriouPitas_BIOID2008,
 author = {I. Kotsia, S. Zafeiriou and I. Pitas}, 
 title = {Discriminant Non-negative Matrix Factorization and Projected Gradients for Frontal Face Verification},
  booktitle = {The First COST 2101 Workshop on Biometrics and Identity Management (BIOID)},
  pages = {},
   year = 2008
  }