\input zb-basic \input zb-ioport \iteman{io-port 70570287} \itemau{Yun, Yeboon; Nakayama, Hirotaka; Yoon, Min} \itemti{Sequential approximation method in multi-objective optimization using aspiration level approach} \itemso{EMO, 317-329 (2006).} \itemcc{} \itemut{} \itemli{doi:10.1007/978-3-540-70928-2\_26} \end