Bock R, Meier J, Nyúl LG, Wärntges S, Michelson G, Hornegger J. Appearance-based Approach to Extract an Age-related Biomarker from Retinal Images. In: Hornegger J, Mayr EW, Schookin S, Feußner H, Navab N, Gulyaev YV et al., editors. 3rd Russian-Bavarian Conference on Bio-Medical Engineering, Proceedings. Vol 1. Erlangen: Friedrich-Alexander University Erlangen-Nuremberg; 2007. 1. p. 127-131p. 

Michelson G, Wärntges S, Bock R, Nyúl LG, Hornegger J. Extraction of an Age-Related Biomarker From Retinal Images Using Appearance Based Approach. INVESTIGATIVE OPHTHALMOLOGY & VISUAL SCIENCE. 2007;48(5):2167.