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by Evans; Gerald William
by Greco, Salvatore; Ehrgott, Matthias; Figueira, Jose Rui
by Zhang, Xiaolu; Xu, Zeshui
by Matsatsinis, Nikolaos; Grigoroudis, Evangelos
by Greco, Salvatore; Ehrgott, Matthias; Figueira, José Rui
by Xiaolu Zhang; Zeshui Xu
by Salvatore Greco
by Nikolaos Matsatsinis