[1]. J. L. Liang, E. J. Dziuban, G. F. Craun, V. Hill, M. R. Moore, R. J. Gelting, R. L. Calderon, M. J. Beach and S. L. Roy, MMWR Surveill. Summ., 2006, 55, 31–58.
[2]. WHO Europe, in Outbreaks of waterborne diseases, European Environment and Health Information System, 2009 (www.euro.who.int/ENHIS).
[3]. C. L. Pankhurst, N. W. Johnson and R. G. Woods, Int. Dent. J., 1998, 48, 359–368.
[4]. J. T. Walker, D. J. Bradshaw, M. R. Fulford, M. V. Martin and P. D. Marsh, in Chance or Necessity?, ed. P. Gilbert, D. Allison, M. Brading, J. Verran and J. Walker, BioLine, Cardiff, 2001, pp. 333–340.
[5]. F. F. S. Franco, D. Spratt, J. C. Leao and S. R. Porter, Biofilms, 2005, 2, 9–17.