@article{
  author = {Saadatmand, زهره, Nadi, M.A, Taherzadeh, نسترن},
  title = {The effectiveness of mathematics teaching based on
problem-solving on the educational achievement
of elementary school students},
  journal = {Educational researches},
  year = {2011},
  volume = {6},
  issue = {28},
  pages = {121-144},
  doi = {},
  url = {https://sanad.iau.ir/fa/Article/941501}
}