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-rw-r--r--docs/source/references.rst5
-rw-r--r--docs/source/usage/operations/transformations/index.rst1
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diff --git a/docs/source/references.rst b/docs/source/references.rst
index ad5f16bf..320e401b 100644
--- a/docs/source/references.rst
+++ b/docs/source/references.rst
@@ -60,6 +60,11 @@ References
`Geodesics on an ellipsoid
<https://en.wikipedia.org/wiki/Geodesics_on_an_ellipsoid>`_.
+.. [Häkli2016] P. Häkli, M. Lidberg, L. Jivall, et al, 2016,
+ `The NKG2008 GPS Campaign - final transformation results and a new common Nordic reference frame
+ <https://doi.org/10.1515/jogs-2016-0001>`_,
+ Journal of Geodetic Science, 6(1).
+
.. [Helmert1880] F. R. Helmert, 1880,
`Mathematical and Physical Theories of Higher Geodesy, Vol 1
<https://doi.org/10.5281/zenodo.32050>`_,
diff --git a/docs/source/usage/operations/transformations/index.rst b/docs/source/usage/operations/transformations/index.rst
index 112d9220..5112ffa2 100644
--- a/docs/source/usage/operations/transformations/index.rst
+++ b/docs/source/usage/operations/transformations/index.rst
@@ -10,6 +10,7 @@ systems are based on different datums.
.. toctree::
:maxdepth: 1
+ deformation
helmert
molodensky
hgridshift