Ha, J., Howitt, P. Accounting for Trends in Productivity and R&D: A Schumpeterian Critique of Semi-Endogenous Growth Theory. Columbia: 2007 с. 733-774,.
Ha, J., Howitt, P. Accounting for Trends in Productivity and R&D: A Schumpeterian Critique of Semi-Endogenous Growth Theory. Columbia: 2007 с. 733-774,.
Ha, J., Howitt, P. (2007) Accounting for Trends in Productivity and R&D: A Schumpeterian Critique of Semi-Endogenous Growth Theory, Columbia: с. 733-774,.
Ha, J., & Howitt, P. (2007). Accounting for Trends in Productivity and R&D: A Schumpeterian Critique of Semi-Endogenous Growth Theory. Columbia: с. 733-774.
Ha J, Howitt P. Accounting for Trends in Productivity and R&D: A Schumpeterian Critique of Semi-Endogenous Growth Theory. Columbia: 2007. p. с. 733-774.