A Framework for Real-Time Face and Facial Feature Tracking using Optical Flow Pre-estimation and Template Tracking - Erik R. Gast; Michael S. Lew (CoRR, 2011)

Very large scale nearest neighbor search: ideas, strategies and challenges. - Erik R. Gast; Ard Oerlemans; Michael S. Lew (Int. J. Multim. Inf. Retr., 2013)