فهرس المقالات Iranian insurance companies حرية الوصول المقاله صفحة الملخص نص كامل 1 - The Relationship between Returns to Scale and Size of Companies using Data Envelopmment Analysis in Iranian Insurance Companies Elham Sadeghi Mohsen Rostami Malkhalife Mohammadreza Miri Lavasani Mohamadhamed Khanmohamadi