@article{ćirić_cakić_rajović_ume_2008, 
  title={Monotone Generalized Nonlinear Contractions in Partially Ordered Metric Spaces}, 
  volume={2008}, 
  DOI={10.1155/2008/131294}, 
  publisher={Springer Nature}, 
  author={Ćirić and Cakić and Rajović and Ume}, 
  year={2008}
  }