@article{lee_lee_jeong_ko_kim_lee_2017, 
  title={Development of Porthole Extrusion Die for Improving Welding Pressure in Welding Chamber by Using Numerical Analysis}, 
  volume={26}, 
  DOI={10.5228/kstp.2017.26.2.115}, 
  publisher={The Korean Society of Technology of Plasticity}, 
  author={Lee and Lee and Jeong and Ko and Kim and Lee}, 
  year={2017}, 
  month={Apr}
  }