Feizpour,M A , , Nayeb,S , and Salehi Firozabadi,G . "Firm Size and Productivity: Evidenced from New Entrants in the Iran's Other Non-Metallic Minerals Industry during the Third Development Plan", Journal of Economic Research (Tahghighat- E- Eghtesadi), 48, 3, 2013, 69-86. doi: 10.22059/jte.2013.35811