Deng-Feng Li 0001 Closeness coefficient based nonlinear programming method for interval-valued intuitionistic fuzzy multiattribute decision making with incomplete preference information. 3402-3418 2011 11 Appl. Soft Comput. 4 https://doi.org/10.1016/j.asoc.2011.01.011 db/journals/asc/asc11.html#Li11