This paper introduces a special kind of multi-depot pickup and delivery problem. In contrast to the general pickup and delivery problem (GPDP, see e.g. [19,31]) all requests have to be picked up at or delivered to one central location which has the function of a hub or consolidation point. In...

In this paper we question the consensus of using a binary crisisdefinition for empirical crisis models. We believe that the most severeshortcomings of the crisis models today are in the crisis definition rather than the explanatory variables ...