Add bibtex reference to the companion paper in the README

[cesarsotovalero]

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@@           Coverage Diff            @@
##             master     #65   +/-   ##
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  Coverage          ?   5.31%           
  Complexity        ?      20           
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  Files             ?      26           
  Lines             ?     979           
  Branches          ?     135           
========================================
  Hits              ?      52           
  Misses            ?     915           
  Partials          ?      12           

Flag	Coverage Δ	Complexity Δ
unittests	5.31% <0.00%> (?)	0.00% <0.00%> (?%)

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