@article{article1059,
  title = {Multi-step optimization of the directly-coupled PV pumping systems},
  author = {FIRATOĞLU, Z.A. and YEŞİLATA, B.},
  journal = {Sigma Journal of Engineering and Natural Sciences},
  year = {2005},
  volume = {23},
  pages = {53-67},
  doi = {}
}