1. Wood, W.F., Snell, J.B.: A quantitative system for classifying landforms. U.S. Army Quartermaster Research and Engineering Center, Natick, MA, Tech. Rep. EP-124 (1960)
2. Fairbridge, R.W.: The Encyclopedia of Geomorphology. Reinhold Book Corp., New York (1968)
3. Curran, H.A., Justus, P.S., Young, D.M., Garver, J.B.: Atlas of Landforms, 3rd edn. John Wiley and Sons, New York (1984)
4. Speight, J.G.: The role of topography in controlling through-flow generation: a discussion. Earth Surf. Processes Landf. 5, 187–191 (1984)
5. Pike, R.J.: Geomorphometry - progress, practice, and prospect. Z. Geomorph. Suppl.-Bd. 101, 221–238 (1995)