add a note about citing PDAL

PDAL · Nov 26, 2018 · 9c14c6a · 9c14c6a
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diff --git a/doc/references.rst b/doc/references.rst
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 References
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-.. index:: References
+.. index:: Citation
+
+Citation
+--------------------------------------------------------------------------------
+
+The PDAL project can be cited in publications as follows:
+
+::
 
+   PDAL: Point Data Abstraction Library [Computer software]. (2018). Retrieved from https://pdal.io.
+
+
+
+.. index:: References
 
 .. [Alexa2003] Alexa, Marc, et al. "Computing and rendering point set surfaces." Visualization and Computer Graphics, IEEE Transactions on 9.1 (2003): 3-15.