tREADME.rst: add commsenv reference - sphere - GPU-based 3D discrete element method algorithm with optional fluid coupling
 (HTM) git clone git://src.adamsgaard.dk/sphere
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 (DIR) commit 0b1e0667a5afb71f96e13e9bcbc5ef84de0fcc08
 (DIR) parent 75a51fc9ac35e999426be7aee9e30d474c358eb0
 (HTM) Author: Anders Damsgaard <anders@adamsgaard.dk>
       Date:   Mon, 11 Jan 2021 10:34:00 +0100
       
       README.rst: add commsenv reference
       
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 (DIR) diff --git a/README.rst b/README.rst
       t@@ -32,6 +32,11 @@ Publications
        ``sphere`` has been used to produce results in the following scientific
        publications and presentations:
        
       +- Damsgaard, A., L. Goren, and J. Suckale (2020), Water pressure fluctuations
       +  control variability in sediment flux and slip dynamic beneath glaciers and
       +  ice streams, Communications Earth & Environment
       +  `doi:10.1038/s43247-020-00074-4>`_.
       +  `<https://doi.org/10.1038/s43247-020-00074-4
        - Damsgaard, A., J. Suckale, J. A. Piotrowski, M. Houssais, M. R. Siegfried, H.
          A. Fricker (2017), Sediment behavior controls equilibrium width of subglacial
          channels, Journal of Glaciology,