docs: public void buildNewReferenceSet2() {
      for (int i = 0; i < getPopulation().size(); i++) {
        DoubleSolution individual = getPopulation().get(i);
        double distanceAux = SolutionUtils
            .distanceToSolutionListInSolutionSpace(individual, referenceSet1);
        distanceToSolutionListAttribute.setAttribute(individual, distanceAux);
      }
  
      int size = referenceSet2Size;
      if (getPopulation().size() < referenceSet2Size) {
        size = getPopulation().size();
      }
  
      for (int i = 0; i < size; i++) {
        // Find the maximumMinimumDistanceToPopulation
        double maxMinimum = 0.0;
        int index = 0;
        for (int j = 0; j < getPopulation().size(); j++) {
  
          DoubleSolution auxSolution = getPopulation().get(j);
          if (distanceToSolutionListAttribute.getAttribute(auxSolution) > maxMinimum) {
            maxMinimum = distanceToSolutionListAttribute.getAttribute(auxSolution);
            index = j;
          }
        }
        DoubleSolution individual = getPopulation().get(index);
        getPopulation().remove(index);
  
        // Update distances to REFSET in population
        for (int j = 0; j < getPopulation().size(); j++) {
          double aux = SolutionUtils.distanceBetweenSolutionsInObjectiveSpace(getPopulation().get(j), individual);
  
          if (aux < distanceToSolutionListAttribute.getAttribute(individual)) {
            DoubleSolution auxSolution = getPopulation().get(j);
            distanceToSolutionListAttribute.setAttribute(auxSolution, aux);
          }
        }
  
        // Insert the individual into REFSET2
        marked.setAttribute(individual, false);
        referenceSet2.add(individual);
  
        // Update distances in REFSET2
        for (int j = 0; j < referenceSet2.size(); j++) {
          for (int k = 0; k < referenceSet2.size(); k++) {
            if (i != j) {
              double aux = SolutionUtils.distanceBetweenSolutionsInObjectiveSpace(referenceSet2.get(j), referenceSet2.get(k));
              DoubleSolution auxSolution = referenceSet2.get(j);
              if (aux < distanceToSolutionListAttribute.getAttribute(auxSolution)) {
                distanceToSolutionListAttribute.setAttribute(auxSolution, aux);
              }
            }
          }
        }
      }
    }