references fixed

git-svn-id: https://svn.osgeo.org/grass/grass/trunk@36521 15284696-431f-4ddb-bdfa-cd5b030d7da7

raster/r.slope.aspect/r.slope.aspect.html

@@ -157,11 +157,14 @@ aspect is computed. The aspect for all cells with slope <
 
 <h2>REFERENCE</h2>
 
-Horn, B. K. P. (1981). Hill Shading and the Reflectance Map, Proceedings
+<ul>
+<li> Horn, B. K. P. (1981). <i>Hill Shading and the Reflectance Map</i>, Proceedings
 of the IEEE, 69(1):14-47.
-Hofierka, J., Mitasova, H., Neteler, M., 2008. Geomorphometry in GRASS GIS. 
-In: Hengl, T. and Reuter, H.I. (Eds), Geomorphometry: Concepts, Software, Applications. 
-Developments in Soil Science, vol. 33, Elsevier, 387-410 pp.
+<li> Hofierka, J., Mitasova, H., Neteler, M., 2009. <i>Geomorphometry in GRASS GIS.</i>
+In: Hengl, T. and Reuter, H.I. (Eds), <i>Geomorphometry: Concepts, Software, Applications. </i>
+Developments in Soil Science, vol. 33, Elsevier, 387-410 pp,
+<a href="http://www.geomorphometry.org">http://www.geomorphometry.org</a>
+</ul>
 
 <h2>SEE ALSO</h2>
 <em><a href="r.mapcalc.html">r.mapcalc</a></em>,