1. Abramson, N. (1963). Information theory and coding. New York: McGraw-Hill.
2. Alberdi Pons, X., Gibaja Martíns, J. J., & Davide Parrilli, M. (2014). Evaluación de la fragmentación en los Sistemas Regionales de Innovación: Una tipología para el caso de España. Investigaciones Regionales,
1(28), 7–35.
3. Ashby, W. R. (1964). Constraint analysis of many-dimensional relations. General Systems Yearbook,
9, 99–105.
4. Balconi, M., Breschi, S., & Lissoni, F. (2004). Networks of inventors and the role of academia: an exploration of Italian patent data. Research Policy,
33(1), 127–145.
5. Biggiero, L. (1998). Italian industrial districts: a triple helix pattern of problem solving. Industry and Higher Eductation,
12(4), 227–234.