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Stock JH, Watson MW. Introduction to econometrics. Fourth edition. Harlow, United Kingdom: : Pearson Education Limited 2020. https://bibliu.com/users/saml/samlUCL?RelayState=eyJjdXN0b21fbGF1bmNoX3VybCI6IiMvdmlldy9ib29rcy85NzgxMjkyMjY0NTIzL3BkZjJodG1sZXgvaW5kZXguaHRtbCJ9