@article{
  author = {Haji-Badali, A., Zaeim, A. H., Karami, R.},
  title = {Einstein structures on four-dimensional nutral Lie groups},
  journal = {Journal of New Researches in Mathematics},
  year = {2019},
  volume = {4},
  issue = {4},
  pages = {137-144},
  doi = {},
  url = {https://sanad.iau.ir/fa/Article/798848}
}