Nuortimo K, Härkönen J. The first wave impact of the COVID-19 pandemic on the Nasdaq Helsinki stock exchange: Weak signal detection with managerial implications. JISIB [Internet]. 2021 Oct. 13 [cited 2024 Dec. 23];11(2):30-42. Available from: https://journal.lu.lv/JISIB/article/view/2321