Move citation information to the main page

Change-Id: Id8b803ac0ddb02390a422197565ec5e74378304f

docs/source/acknowledgements.rst

diff --git a/docs/source/acknowledgements.rst b/docs/source/acknowledgements.rst
index 049a380..36c1562 100644
--- a/docs/source/acknowledgements.rst
+++ b/docs/source/acknowledgements.rst
@@ -22,4 +22,4 @@
 Since the initial release of Ceres, a number of people have
 contributed to Ceres by porting it to new platforms, reporting bugs,
 fixing bugs and adding new functionality. We acknowledge all of these
-contributions in :ref:`chapter-version-history`.
+contributions in the :ref:`chapter-version-history`.

docs/source/citation.rst

diff --git a/docs/source/citation.rst b/docs/source/citation.rst
deleted file mode 100644
index ad73577..0000000
--- a/docs/source/citation.rst
+++ /dev/null
@@ -1,12 +0,0 @@
-========
-Citation
-========
-
-If you use Ceres Solver for an academic publication, please cite this
-manual. e.g., ::
-
-  @manual{ceres-manual,
-          Author = {Sameer Agarwal and Keir Mierle},
-          Title = {Ceres Solver: Tutorial \& Reference},
-          Organization = {Google Inc.}
-  }

docs/source/index.rst

diff --git a/docs/source/index.rst b/docs/source/index.rst
index f3b792f..0111600 100644
--- a/docs/source/index.rst
+++ b/docs/source/index.rst
@@ -26,6 +26,13 @@
 * File bugs, feature requests in the `issue tracker
   <https://code.google.com/p/ceres-solver/issues/list>`_.
 
+* If you use Ceres Solver for a publication, you must cite it as::
+
+    @misc{ceres-solver,
+      author = "Sameer Agarwal and Keir Mierle",
+      title = "Ceres Solver",
+      howpublished = "\url{https://code.google.com/p/ceres-solver/}",
+    }
 
 .. toctree::
    :maxdepth: 1
@@ -42,4 +49,3 @@
    version_history
    bibliography
    license
-   citation