@article{
  author = {Mohammadpouri, A., Kafili, L., Hosseinoghli, R.},
  title = {L_1 operator and Gauss map of quadric surfaces},
  journal = {Journal of New Researches in Mathematics},
  year = {2019},
  volume = {5},
  issue = {4},
  pages = {81-90},
  doi = {},
  url = {https://sanad.iau.ir/fa/Article/797835}
}