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Baltagi, B., Sickles, R., Hao, J., & Shang, C. (2015-01-15). Panel Data and Productivity Measurement. In The Oxford Handbook of Panel Data. : Oxford University Press. Retrieved 8 Apr. 2020, from https://www.oxfordhandbooks.com/view/10.1093/oxfordhb/9780199940042.001.0001/oxfordhb-9780199940042-e-17.