Update index.rst

ECCCO-mission · Jul 18, 2024 · cadd4f4 · cadd4f4
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@@ -4,7 +4,9 @@ Welcome to overlappogram's documentation!
 =========================================
 
 Overlappogram is a Python package for inverting overlappogram observations
-of the Sun, for examples MaGIXS, CubIXSS, or ECCCO observations.
+of the Sun, for examples MaGIXS, CubIXSS, or ECCCO observations. 
+
+The theoretical background is provided in `this paper <https://arxiv.org/abs/2407.10436v1>`_. 
 
 .. toctree::
    :maxdepth: 2