Salmonella Typhimurium outbreak in Sweden from contaminated jars of helva (or halva)
de Jong, B and Andersson, Y and Giesecke, J and Hellström, L and Stamer, U and Wollin, R, Weekly releases (1997–2007), 5, 1715 (2001), https://doi.org/10.2807/esw.05.29.01715-en