LibeRighSala10 10.1007/s10288-010-0136-6 doi A column generation algorithm for the vehicle routing problem with soft time windows 2011 The Vehicle Routing Problem with Time Windows consists of computing a minimum cost set of routes for a fleet of vehicles of limited capacity visiting a given set of customers with known demand, with the additional constraint that each customer must be visited in a specified time window. We consider the case in which time window constraints are relaxed into "soft" constraints, that is penalty terms are added to the solution cost whenever a vehicle serves a customer outside of his time window. We present a branch-and-price algorithm which is the first exact optimization algorithm for this problem Liberatore, Federico Righini, G. Salani, Matteo 49-82 4OR - A Quarterly Journal of Operations Research 1619-4500 9 1 2011 https://www.springer.com/journal/10288 TRANSP-OR EPFL
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