1. Division of labour — Simon revisited;Artle;Regional Science and Urban Economics,1977
2. Macroeconomics of unbalanced growth;Baumol;American Economic Review,1967
3. Migration, unemployment and development: A two-sector analysis;Harris;American Economic Review,1970
4. A multi-sectoral study of economic growth;Johansen,1960
5. Rules of thumb for the expansion of industries in a process of economic growth;Johansen;Econometrica,1960