add bibtex and fix cite

Documentation/doc/biblio/geom.bib

@@ -152054,3 +152054,13 @@ pages = {179--189}
   year={2009},
   organization={ACM}
 }
+
+@article{ledoux2014triangulation,
+  title={A triangulation-based approach to automatically repair GIS polygons},
+  author={Ledoux, Hugo and Ohori, Ken Arroyo and Meijers, Martijn},
+  journal={Computers \& Geosciences},
+  volume={66},
+  pages={121--131},
+  year={2014},
+  publisher={Elsevier}
+}

Polygon_repair/doc/Polygon_repair/Polygon_repair.txt

@@ -10,7 +10,7 @@ namespace CGAL {
 \section SectionPolygonRepair_Introduction Introduction
 
 This package implements a polygon repair method based on a constrained
-triangulation \cgalCite{14cg}. Starting from a possibly invalid input
+triangulation \cgalCite{ledoux2014triangulation}. Starting from a possibly invalid input
 in the form of a polygon, polygon with holes or multipolygon with holes,
 the method performs a constrained triangulation of the input edges, labels
 each triangle according to what it represents (exterior, polygon interior