Karl F. Doerner Manfred Gronalt Richard F. Hartl Guenter Kiechle Marc Reimann Exact and heuristic algorithms for the vehicle routing problem with multiple interdependent time windows. 3034-3048 2008 35 Computers & OR 9 http://dx.doi.org/10.1016/j.cor.2007.02.012 db/journals/cor/cor35.html#DoernerGHKR08