Mariusz Leszczynski Wladyslaw Skarbek Biometric Verification by Projections in Error Subspaces. 166-173 2007 conf/rskt/2007 RSKT http://dx.doi.org/10.1007/978-3-540-72458-2_20 db/conf/rskt/rskt2007.html#LeszczynskiS07