Merge pull request #7688 from hoskillua/heat-method-doc

Added missing reference to a paper in Heat method

Documentation/doc/biblio/cgal_manual.bib

@@ -2049,6 +2049,16 @@ ABSTRACT = {We present the first complete, exact and efficient C++ implementatio
   update        = "09.11 penarand"
 }
 
+@article{ cgal:sc-lntm-20
+  ,author        = {Nicholas Sharp and Keenan Crane}
+  ,title         = {{A Laplacian for Nonmanifold Triangle Meshes}}
+  ,journal       = {Computer Graphics Forum (SGP)}
+  ,url           = "https://www.cs.cmu.edu/~kmcrane/Projects/NonmanifoldLaplace/NonmanifoldLaplace.pdf"
+  ,volume        = {39}
+  ,number        = {5}
+  ,year          = {2020}
+}
+
 @inproceedings{cgal:ssgh-tmpm-01,
   title={Texture mapping progressive meshes},
   author={Sander, Pedro V and Snyder, John and Gortler, Steven J and Hoppe, Hugues},

Heat_method_3/doc/Heat_method_3/Heat_method_3.txt

@@ -41,7 +41,7 @@ the mathematical theory of the Heat method. The last section is about the \ref s
 
 Note that this package depends on the third party \ref thirdpartyEigen library (3.3 or greater), or another
 model of the concept `SparseLinearAlgebraWithFactorTraits_d`.
-This implementation is based on \cgalCite{cgal:cww-ghnac-13} and \cgalCite{cgal:fsbs-acidt-06}
+This implementation is based on \cgalCite{cgal:cww-ghnac-13} , \cgalCite{cgal:fsbs-acidt-06} , and \cgalCite{cgal:sc-lntm-20}
 
 This package is related to the package \ref PkgSurfaceMeshShortestPath. Both deal with geodesic distances.
 The heat method package computes for every vertex of a mesh an approximate distance to one or several source vertices.