1. Agresti, A. (1996) An Introduction to Categorical Data Analysis. Wiley, New York
2. Braun, B. (1998) Locational Response of German Manufacturers to Environmental Standards. Tijdschrift voor Economische en Sociale Geografie (TESG) 89, 253–263
3. Braun, B., Geibel, J. (1999) The Implementation of Environmental Management: A Milestone in Firm Development? In: Van Dijk, J. & Pellenbarg, P.H. (eds.) Demography of Firms. Spatial Dynamics of Firm Behaviour. Nederlandse Geografische Studies 262. Utrecht, Groningen, 285–302
4. Camagni, R. (ed.) (1991) Innovation Networks: Spatial Perspectives. Belhaven Pinter, London
5. Cooke, P., Morgan, K. (1993) The Network Paradigm: New Departures in Corporate and Regional Development. Environment & Planning D 11, 543–564