Intervisibility on terrains
Leila De Floriani
and Paola Magillo
Geographic Information Systems: Principles, Techniques, Managament and Applications, P. A. Longley,
M. F. Goodchild,
D. J. Maguire,
and D. W. Rhind, ed., John Wiley & Sons, 1999, pp. 543–556
http://citeseer.nj.nec.com/351023.html
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