D. Mrozek-Budzyn, R. Majewska, A. Kiełtyka, and M. Augustyniak, “Rubella outbreak in Poland in 2013 – an analysis of surveillance data at the national and province level”, Pol J Public Health, vol. 125, no. 2, pp. 65–71, Aug. 2015, doi: 10.1515/pjph-2015-0026.