https://phd-proposal.ir/%d8%aa%d9%81%d8%a7%d9%88%d8%aa-%d9%be%d8%b1%d9%88%d9%be%d9%88%d8%b2%d8%a7%d9%84-%d9%88-%d9%be%d8%a7%db%8c%d8%a7%d9%86-%d9%86%d8%a7%d9%85%d9%87/