Andrea Capotorti Andrea Formisano Gianfranco Murador Qualitative Uncertainty Orderings Revised. 43-59 2007 169 Electr. Notes Theor. Comput. Sci. http://dx.doi.org/10.1016/j.entcs.2006.07.028 db/journals/entcs/entcs169.html#CapotortiFM07