Wetter, J. J. The impacts of research and development expenditures [Electronic resource] : the relationship between total factor productivity and U.S. gross domestic product performance / J. J. Wetter. - Electronic text data. - New York, NY : Springer Science+Business Media LLC, 2011. - (Innovation, technology, and knowledge management ; 8). - ISBN 978-1-4419-7530-0 : Б. ц.