List of Articles data-based theory Open Access Article Abstract Page Full-Text 1 - The concept of Urban Entrepreneurship with grounded Theory aproach (case study:Tehran city) mina shahamat nejad babak ziyae Majid Ashrafi Fereydoon Azma Open Access Article Abstract Page Full-Text 2 - A model for interaction of supervisory institutions and price reporting institutions to improve the efficiency of the crude oil pricing system in oil markets using classical data-base theory mohamad mahdi hajian Atefeh Taklif Hamed Soltaninejad 10.61186/mf.26857.21.70.75