TY - JOUR AU - He, Cheng AU - Li, Li TI - Hierarchical optimization on an unbounded parallel-batching machine JO - RAIRO - Operations Research - Recherche Opérationnelle PY - 2018 SP - 55 EP - 60 VL - 52 IS - 1 PB - EDP-Sciences UR - http://archive.numdam.org/articles/10.1051/ro/2017089/ DO - 10.1051/ro/2017089 LA - en ID - RO_2018__52_1_55_0 ER -