TY - JOUR T1 - Uncovering spatial productivity centers using asymmetric bidirectional spillovers JO - European Journal of Operational Research PY - 2020/09/01 AU - Glass AJ AU - Kenjegalieva K AU - Douch M ED - DO - DOI: 10.1016/j.ejor.2020.02.007 PB - Elsevier BV VL - 285 IS - 2 SP - 767 EP - 788 Y2 - 2025/01/13 ER -