A new approach for ranking of trapezoidal fuzzy numbers. - Saeid Abbasbandy; T. Hajjari (Comput. Math. Appl., 2009)

Weighted trapezoidal approximation-preserving cores of a fuzzy number. - Saeid Abbasbandy; T. Hajjari (Comput. Math. Appl., 2010)

A note on "The revised method of ranking LR fuzzy number based on deviation degree". - T. Hajjari; Saeid Abbasbandy (Expert Syst. Appl., 2011)