Upgrading nodes in tree-shaped hub location
Upgrading nodes in tree-shaped hub location is a scholarly work, published in 2019 in ''Computers and Operations Research''. The main subjects of the publication include integer programming, vehicle routing problem, humanitarian logistics, Facility location, packing problem, mathematical optimization, linear programming, tree, and computer science. The authors present two different Mixed Integer Linear Programming formulations for the problem, tighten the formulations and generate several families of valid inequalities for them.