Fritsch, Michael, Maria Greve and Michael Wyrwich: The COVID-19 Pandemic and Entrepreneurship in Germany: First Observations and Interpretations. Jena Economic Research Papers #2021-007, Friedrich Schiller University Jena (with Maria Greve and Michael Wyrwich). http://www2.wiwi.uni-jena.de/Papers/jerp2021/wp_2021_007.pdf