G. Sirbiladze A. Sikharulidze Weighted Fuzzy Averages in Fuzzy Environment: Part I. Insufficient Expert Data and Fuzzy Averages. 139-158 2003 11 International Journal of Uncertainty, Fuzziness and Knowledge-Based Systems 2 http://dx.doi.org/10.1142/S0218488503001989 db/journals/ijufks/ijufks11.html#SirbiladzeS03