H. Schek. SIGIR, page 55-70. Cambridge University Press, on behalf of the British Computer Society (copyright by British Informatics Society Ltd, a subsidiary of the British Computer Society), (1984)
L. Relly, A. Kuckelberg, and H. Schek. Spatio-Temporal Database Management, volume 1678 of Lecture Notes in Computer Science, page 135-151. Springer, (1999)
R. Weber, K. Böhm, and H. Schek. State-of-the-Art in Content-Based Image and Video Retrieval, volume 22 of Computational Imaging and Vision, page 319-343. Kluwer / Springer, (1999)