@article{shakourifar_enright_2011, 
  title={Reliable Approximate Solution of Systems of Volterra Integro-Differential Equations with Time-Dependent Delays}, 
  volume={33}, 
  DOI={10.1137/100793098}, 
  publisher={Society for Industrial & Applied Mathematics (SIAM)}, 
  author={Shakourifar and Enright}, 
  year={2011}
  }