Professional football clubs and empirical evidence from the COVID-19 crisis : time for sport entrepreneurship?Hammerschmidt, Jonas; Durst, Susanne; Kraus, Sascha; Puumalainen, KaisuTechnological forecasting and social change2021 / art. 120572 https://doi.org/10.1016/j.techfore.2021.120572 Journal metrics at Scopus Article at Scopus Journal metrics at WOS Article at WOS