Rosa María Rodríguez, Luis Martínez, Francisco HerreraHesitant Fuzzy Linguistic Term Sets for Decision Making
IEEE Transactions on Fuzzy Systems, vol. 20. pp. 109 - 119, 2012.
Luis Martínez, Da Ruan, Francisco HerreraComputing with Words in Decision support Systems: An overview on Models and Applications
International Journal of Computational Intelligence Systems (IJCIS), vol. 3. Atlantis Press, pp. 382-395, 2010.