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@@ -342,7 +342,7 @@ problem, Computers and Mathematics with Applications, v.16, p. 983-992.
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</p>
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<p>
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-<a href="http://mpa.itc.it/grasstutor/">
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+<a href="http://www.grassbook.org">
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Neteler, M. and Mitasova, H., 2004, Open Source GIS: A GRASS GIS Approach, Second Edition, </a>
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Kluwer International Series in Engineering and Computer Science, 773, Kluwer Academic Press / Springer,
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Boston, Dordrecht, 424 pages.
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