1. University of Aveiro,Center for Research & Development in Mathematics and Applications,Department of Mathematics,Aveiro,Portugal
2. Industrial Engineering and Tourism,PhD Student of Industrial Engineering and Management,Department of Economics, Management,Aveiro,Portugal
3. University of Aveiro,Master Student of Mathematics and Applications,Department of Mathematics,Aveiro,Portugal
4. Vista Alegre Atlantis, S.A,Technology and Quality Department,Ílhavo,Portugal