@congreso_internacional{547, author = {Francisco Herrera and Enrique Herrera-Viedma and Luis Martínez}, title = {A Hierarchical Ordinal Model for Managing Unbalanced Linguistic Term Sets based on the Linguistic 2-tuple model}, year = {2001}, pages = {201-206}, month = {April 25-28th}, publisher = {Eurofuse Workshop on Preference Modelling and Applications}, address = {, Granada (Spain)}, }