From: bangerth <bangerth@0785d39b-7218-0410-832d-ea1e28bc413d>
Date: Fri, 12 Aug 2011 16:10:07 +0000 (+0000)
Subject: Add a reference to some literature.
X-Git-Url: https://gitweb.dealii.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=ca78ca015d789c9f4cbfd007bdfe1f3aa592c2ae;p=dealii-svn.git

Add a reference to some literature.


git-svn-id: https://svn.dealii.org/trunk@24048 0785d39b-7218-0410-832d-ea1e28bc413d
---

diff --git a/deal.II/include/deal.II/lac/constraint_matrix.h b/deal.II/include/deal.II/lac/constraint_matrix.h
index 9442fbc223..94f5364fe2 100644
--- a/deal.II/include/deal.II/lac/constraint_matrix.h
+++ b/deal.II/include/deal.II/lac/constraint_matrix.h
@@ -107,6 +107,15 @@ namespace internals
  * been added, you need to call close(), which compresses the storage format
  * and sorts the entries.
  *
+ * @note Many of the algorithms this class implements are discussed in
+ * the @ref hp_paper . The algorithms are also related to those shown
+ * in <i>M. S. Shephard: Linear multipoint constraints applied via
+ * transformation as part of a direct stiffness assembly process. Int. J.
+ * Numer. Meth. Engrg., vol. 20 (1984), pp. 2107-2112.</i>, with the
+ * difference that the algorithms shown there completely eliminated
+ * constrained degrees of freedom, whereas we usually keep them as part
+ * of the linear system.
+ *
  * @ingroup dofs
  * @ingroup constraints
  * @author Wolfgang Bangerth, Martin Kronbichler, 1998, 2004, 2008, 2009