TY - GEN AU - Espejo Miranda, Inmaculada AU - Marín, Alfredo A4 - Estadística e Investigación Operativa PY - 2026 SN - 0305-0483 UR - http://hdl.handle.net/10498/39071 AB - We examine several facility location problems within a directed network involving two distinct cost types. The first, referred to as the ‘‘customer cost’’, represents the expense each customer considers when selecting a facility to obtain service... LA - eng PB - Elsevier KW - Facility location problems KW - Upgrading KW - p-median KW - Hubs KW - Two-stage KW - Tree of hubs TI - Discrete location models with customers’ choice and path improvements DO - 10.1016/J.OMEGA.2025.103458 ER -