Decentralized two-level 0-1 programming through genetic algorithms with double strings. - Keiichi Niwa; Ichiro Nishizaki; Masatoshi Sakawa (KES (2), 1998)

Computational Methods for Two-level Linear Programming Problems With Fuzzy Parameters Through Genetic Algorithms. - Keiichi Niwa; Ichiro Nishizaki; Masatoshi Sakawa (FUZZ-IEEE, 2001)

Multiobjective two-level 0-1 programming through distributed genetic algorithms. - Keiichi Niwa; Tomohiro Hayashida; Masatoshi Sakawa (FUZZ-IEEE, 2011)