Update reference.rst

Author: Evolutionary-Intelligence

docs/sphinx/source/reference.rst

@@ -46,6 +46,10 @@ Critical Papers to Some Metaphors-Based Optimization
 * 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
+* 2022: `Metaphor-based metaheuristics, a call for action: The
+  elephant in the room
+  <https://link.springer.com/article/10.1007/s11721-021-00202-9>`_
+  https://doi.org/10.1007/s11721-021-00202-9
 * 2020: `Nature inspired optimization algorithms or simply variations
   of metaheuristics?
   <https://link.springer.com/article/10.1007/s10462-020-09893-8>`_