Update reference.rst

Author: Evolutionary-Intelligence

docs/sphinx/source/reference.rst

@@ -7,6 +7,8 @@ Critical Papers to Some (Rather All) Metaphors-Based Optimization
 
 * 2025: `On the structural and statistical flaws of the * optimizer
   <https://arxiv.org/abs/2511.17557>`_
+* 2020: `Benchmarking in optimization: Best practice and open issues
+  <https://arxiv.org/abs/2007.03488>`_
 * 2019: `Bio-inspired computation: Where we stand and what's next
   <https://www.sciencedirect.com/science/article/abs/pii/S2210650218310277>`_
 * 2018: `An insight into bio-inspired and evolutionary algorithms