4Albert P. Finding Minimal Cost Paths in Raster Geographic Information System Map Representations, Genetic Algrithms, Simulated Annealing and Tabu Seareh[D]. USA: Kent State University,2004.
5Bresenham J E. Algorithms for Computer Control of a Digital Plotter[J ]. IBM Systems Journal, 1965, 4 (1) : 25-33.