Brown, L. A.1999: Presidential address: change, continuity, and the pursuit of geographic understanding. Annals of the Association of American Geographers89, 1-25.
2.
Coleman, J. S., Katz, E. and Menzel, H.1966: Medical innovation: a diffusion study. Indianapolis: The Bobbs-Merrill Company.
3.
Hägerstrand, T.1967: Innovation diffusion as a spatial process. Chicago: University of Chicago Press.
4.
Van den Bulte, C. and Lilien, G. L.2001: Medical innovation revisited: social contagion versus marketing effort. American Journal of Sociology106, 1409-1435.
