@article{singer_konstantinidis_roubik_beffermann_2009, 
  title={Does e-procurement save the state money?}, 
  DOI={10.1108/jopp-09-01-2009-b002}, 
  publisher={Emerald}, 
  author={Singer and Konstantinidis and Roubik and Beffermann}, 
  year={2009}
  }