1. Abramson N: Information Theory and Coding. 1963, McGraw-Hill, New York, etc
2. Ashby WR: Constraint analysis of many-dimensional relations. General Systems Yearbook. 1964, 9: 99-105.
3. Beccatini G, Bellandi M, Ottati GD, Sforzi F (2003) From industrial districts to local development: an itinerary of research. Edward Elgar, Cheltenham, UK; Northhampton, MA
4. Bornmann L, Wagner C, Leydesdorff L (2014) BRICS countries and scientific excellence: a bibliometric analysis of most frequently-cited papers. J\ Assoc Inform Sci Tech, in press
5. Braczyk H-J, Cooke P, Heidenreich M (eds) Regional innovation systems. 1998, University College London Press, London/ Bristol PA