MAP20110006471 Soumpasis, Ilias Development of a self-regulated dynamic model for the propagation of salmonella typhimurium in pig farms / Ilias Soumpasis and Francis Butler En: Risk analysis : an international journal. - McLean, Virginia : Society for Risk Analysis, 1987-2015 = ISSN 0272-4332. - Tomo 31 Número 1 - 2011 I. Butler, Francis .