SS is a evolutionary and population metaheuristic that recombines solutions selected
from a reference set to build others [491].
++++++The method starts by generating an
initial population Pop satisfying the criteria of diversity and quality.
++++++The reference
set (RefSet) of moderate size13 is then constructed by selecting good representative
solutions from the population.
++++++ The selected solutions are combined to provide starting
solutions to an improvement procedure based on a S-metaheuristic.
++++++According to
the result of such procedure, the reference set and even the population of solutions
are updated to incorporate both high-quality and diversified solutions.
++++The process is
iterated until a stopping criterion is satisfied.