Update reference.rst

Author: Evolutionary-Intelligence

docs/sphinx/source/reference.rst

@@ -10,6 +10,7 @@ Critical Papers to Some Metaphors-Based Optimization
 * 2023: `Exposing the *, *, *, *, *, and * algorithms: Six
   misleading optimization techniques inspired by bestial metaphors
   <https://onlinelibrary.wiley.com/doi/full/10.1111/itor.13176>`_
+  https://doi.org/10.1111/itor.13176
 * 2022: `A new taxonomy of global optimization algorithms
   <https://link.springer.com/article/10.1007/s11047-020-09820-4>`_
   https://doi.org/10.1007/s11047-020-09820-4