* Article, ''The Stopp Corona app - Austria as a forerunner in the development of contact-tracing-apps'', COVID-19 Global Insights Ebook<ref>https://issuu.com/abarriguda/docs/publicar_-_ebook_covid-19-global-insights_</ref> | * Article, ''The Stopp Corona app - Austria as a forerunner in the development of contact-tracing-apps'', COVID-19 Global Insights Ebook<ref>https://issuu.com/abarriguda/docs/publicar_-_ebook_covid-19-global-insights_</ref> |