@article{ng05b,
  title =	 {Crane scheduling in container yards with inter-crane
                  interference},
  volume =	 164,
  issn =	 03772217,
  url =
                  {http://linkinghub.elsevier.com/retrieve/pii/S0377221703009251},
  doi =		 {10.1016/j.ejor.2003.11.025},
  number =	 1,
  journal =	 {European Journal of Operational Research},
  author =	 {W Ng},
  year =	 2005,
  pages =	 {64--78}
}