Curvature preserving fingerprint ridge orientation smoothing using Legendre polynomials. - Surinder Ram; Horst Bischof; Josef A. Birchbauer (CVPR Workshops, 2008)

Detection of Singularities in Fingerprint Images Using Linear Phase Portraits. - Surinder Ram; Horst Bischof; Josef A. Birchbauer (Handbook of Remote Biometrics, 2009)

Active Fingerprint Ridge Orientation Models. - Surinder Ram; Horst Bischof; Josef A. Birchbauer (ICB, 2009)

Modelling fingerprint ridge orientation using Legendre polynomials. - Surinder Ram; Horst Bischof; Josef A. Birchbauer (Pattern Recognit., 2010)