@article{
  author = {},
  title = {Study the Effect of  Teaching Problem-Solving Skill on  First Year High School Male Students’ Acheivement in Sonqor City in academic year(2010-2011)},
  journal = {Educational Administration Research},
  year = {2011},
  volume = {3},
  number = {9},
  pages = {117-134},
  doi = {}
}