What are the worst cases in constrained Last-In-First-Out pick-up and delivery problems?

Urrutia, Sde Werra, D2018-11-082018-11-082018-11-08201810.1016/j.ejor.2018.04.005https://infoscience.epfl.ch/handle/20.500.14299/151221WOS:000436347700003What are the worst cases in constrained Last-In-First-Out pick-up and delivery problems?text::journal::journal article::research article