Search for: [References = "25. Toppe R., 1987. Terrain models\: A tool for natural hazard mapping \[in\:\] B. Salm, H. Gubler \(eds.\), Avalanche formation, movements and effects \(Proceedings of the Davos Symposium, September 1986\), International Association of Hydrological Sciences \(IAHS\), no. 162, pp. 629\-638."]