Google translate of the press release from the university of Copenhagen. (original in danish) <a href="https://translate.google.com/translate?sl=da&tl=en&u=https%3A%2F%2Fwww.science.ku.dk%2Fpresse%2Fnyhedsarkiv%2F2020%2Fforskere-fik-travlt-havde-naer-foraeret-loesning-paa-matematikgaade-fra-1980erne-vaek%2F" rel="nofollow">https://translate.google.com/translate?sl=da&tl=en&u=https%3...</a>