Tien-Chin Wang Shu-Chen Peng Shu-Chen Hsu Jui-Fang Chang An Approach to Group Decision Making Based on Incomplete Linguistic Preference Relations. 631-634 2009 IAS http://dx.doi.org/10.1109/IAS.2009.204 conf/IEEEias/2009 db/conf/IEEEias/IEEEias2009.html#WangPHC09