@article{article833,
  title = {Six Sigma and Lean Six Sigma: A Literature Survey},
  author = {AKKAYA, G. and TURANOĞLU, B. and ÖZTAŞ, S.},
  journal = {Sigma Journal of Engineering and Natural Sciences},
  year = {2014},
  volume = {32},
  pages = {503-523},
  doi = {}
}