@article{ravetti_mateus_rocha_pardalos_2007, 
  title={A scheduling problem with unrelated parallel machines and sequence dependent setups}, 
  DOI={10.1504/ijor.2007.014169}, 
  publisher={Inderscience Publishers}, 
  author={Ravetti and Mateus and Rocha and Pardalos}, 
  year={2007}
  }