Soltanisehat, Leili, Alizadeh, Reza, Mehregan, Nader. (1398). Research and Development Investment and Productivity Growth in Firms with Different Levels of Technology. , 23(4), 795-818. doi: 10.22059/ier.2019.72991
Leili Soltanisehat; Reza Alizadeh; Nader Mehregan. "Research and Development Investment and Productivity Growth in Firms with Different Levels of Technology". , 23, 4, 1398, 795-818. doi: 10.22059/ier.2019.72991
Soltanisehat, Leili, Alizadeh, Reza, Mehregan, Nader. (1398). 'Research and Development Investment and Productivity Growth in Firms with Different Levels of Technology', , 23(4), pp. 795-818. doi: 10.22059/ier.2019.72991
Soltanisehat, Leili, Alizadeh, Reza, Mehregan, Nader. Research and Development Investment and Productivity Growth in Firms with Different Levels of Technology. , 1398; 23(4): 795-818. doi: 10.22059/ier.2019.72991


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