A constant-factor approximation algorithm for multi-vehicle collection for processing problem

@article{Ycel2013ACA,
  title={A constant-factor approximation algorithm for multi-vehicle collection for processing problem},
  author={Eda Y{\"u}cel and F. Sibel Salman and E. Lerzan {\"O}rmeci and Esma Senturk Gel},
  journal={Optimization Letters},
  year={2013},
  volume={7},
  pages={1627-1642}
}