@article{article1093,
  title = {Analysis of fuels price and unit fuel cost on cogeneration systems},
  author = {ERDEM, H.H. and SEVİLGEN, S.H. and ÇETİN, B. and AKKAYA, A.V.},
  journal = {Sigma Journal of Engineering and Natural Sciences},
  year = {2004},
  volume = {22},
  pages = {128-138},
  doi = {}
}