1. Measles cases at highest point since 2006 as outbreaks continue to spread
2. World Health Organization. New measles surveillance data from WHO. 12 Aug 2019. www.who.int/immunization/newsroom/new-measles-data-august-2019/en.
3. WHO Regional Office for Europe. Seventh meeting of the European Regional Verification Commission for Measles and Rubella Elimination (RVC). Jun 2018. http://www.euro.who.int/__data/assets/pdf_file/0008/378926/7th-RVC-Meeting-Report-FINAL.pdf?ua=1.