@article{
  author = {Alireza Khazabi, Mina, Abbasian, Hossein},
  title = {Evaluation of the effectiveness of virtual mathematics teaching based on manipulative mathematical learning in 6th-grade elementary male students in 5th districts of Tehran in Covid-19 pandemic},
  journal = {Curriculum Research Journal},
  year = {2022},
  volume = {3},
  issue = {4},
  pages = {0-0},
  doi = {},
  url = {https://sanad.iau.ir/fa/Article/933792}
}