1. Davids, K., Ara*, D., and Shuttleworth, R. (2005), Applications of dynamical systems theory to football. In Reilly, T., Cabri, J. and Ara*, D. (Eds.). Science and Football V: The proceedings of the fifth world congress on science and football (pp. 556–569). London: Routledge.
2. Glaser, B., and Strauss, A. (1967), The discovery of grounded theory: Strategies for qualitative research. New York: Aldine Transaction.
3. Hughes, M., Landridge, C., and Dawkin, N. (1998b), Perturbation leading to shooting in soccer. In Hughes, M. and Tavares, F. (Eds.). Proceedings of the Notational Analysis of Sport IV World Congress (p. 33–40). Porto: FCDEF-UP.
4. McGarry, T., and Franks, I. (2003). The science of match analysis. In T. Reilly and M. Williams (Eds.), Science and Soccer (pp.265–275). London: Routledge - Taylor and Francis Group.
5. Merriam, S. (1988), Case study research in education. A qualitative approach. San Francisco: Jossey-Bass Publishers.