Ortenzi, R., R. Branciari, S. Primavilla, D. Ranucci, and A. Valiani. “Behaviour of Listeria Monocytogenes in Artisanal Raw Milk Pecorino Umbro Cheese: A Microbiological Challenge Test”. Italian Journal of Food Safety, vol. 4, no. 3, Sept. 2015, doi:10.4081/ijfs.2015.5370.