1. In search of useful theory of innovation
2. Technical Change Centre Report TCC R‐83–015;Barras R.,1983
3. Hobsbawm , E.3. 1968. “‘Industry and Empire’”. Weidenfeld and Nicholson.
4. Kuznets , S. 1953. “‘Economic Change’”. W.W. Norton. An idea first given prominence by Kuznets: see