Fiebig, L., Smieszek, T., Saurina, J., Hattendorf, J. and Zinsstag, J. (2009) “Contacts between poultry farms, their spatial dimension and their relevance for avian influenza preparedness”, Geospatial Health, 4(1), pp. 79–95. doi: 10.4081/gh.2009.212.