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Nili, M. & Maleki, M. (2006). INFORMAL ECONOMY: CAUSES, IMPACTS ON THE FORMAL SECTOR AND METHODS OF ESTIMATION. Sharif Journal of Industrial Engineering & Management, Vol.22(36), 45–56.
Nili, M., & Maleki, M. "INFORMAL ECONOMY: CAUSES, IMPACTS ON THE FORMAL SECTOR AND METHODS OF ESTIMATION", Sharif Journal of Industrial Engineering & Management, Vol.22, 36, 2006, 45–56.
Nili, M., & Maleki, M. (2006). 'INFORMAL ECONOMY: CAUSES, IMPACTS ON THE FORMAL SECTOR AND METHODS OF ESTIMATION', Sharif Journal of Industrial Engineering & Management, Vol.22(36), pp. 45–56.
Nili, M. & Maleki, M., "INFORMAL ECONOMY: CAUSES, IMPACTS ON THE FORMAL SECTOR AND METHODS OF ESTIMATION." Sharif Journal of Industrial Engineering & Management, Vol.22 36 (2006): 45–56,
Nili M., Maleki M. INFORMAL ECONOMY: CAUSES, IMPACTS ON THE FORMAL SECTOR AND METHODS OF ESTIMATION. SJIE. 2006;Vol.22(36):45–56 (In Persian).