%0 Journal Article %A He, Cheng %A Li, Li %T Hierarchical optimization on an unbounded parallel-batching machine %J RAIRO - Operations Research - Recherche Opérationnelle %D 2018 %P 55-60 %V 52 %N 1 %I EDP-Sciences %U http://archive.numdam.org/articles/10.1051/ro/2017089/ %R 10.1051/ro/2017089 %G en %F RO_2018__52_1_55_0