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https://www.gauss-friends.org/2020/03/16/de-gauss-telegraph-praeventive-massnahmen-zum-schutz-vor-dem-coronavirus-covid-19-im-gauss-haus-en-gauss-telegraph-preventive-measures-for-protection-against-the-coronavirus-covid-19-in-gauss/
Preventive measures for protection against the coronavirus COVID-19 in Gauss Haus