@article{tyagi_2013, 
  title={A Note on Vorticity of Unsteady MHD Free Convection and Mass Transfer Flow of Visco-elastic fluid through Porous Medium with Constant Suction and Heat flux}, 
  DOI={10.9790/5728-0814956}, 
  publisher={IOSR Journals}, 
  author={Tyagi}, 
  year={2013}
  }