1. Uncertainty, evolution and economic theory;A A Alchian;Journal of Political Economy,1950
2. A model of innovation with application to new financial products;F Allen;Financial Innovation and Risk Sharing. Cambridge, M ass,1986
3. Competition in communications;M Armstrong;Oxford Review of Economic Policy,1997
4. Production and service supply structure: temporality and complimentarity relations;W B Arthur;The Changing Geography of Advanced Producer Services edited by P. Daniels and F. M oulaert,1986