WARNING:
If you click on the following link, you leave to an external site.

http://www.bva.bund.de/DE/Organisation/Abteilungen/Abteilung_ZfA/Auslandsschularbeit/MessenundVeranstaltungen/Messe_Didacta/Messe_didacta_Hannover-2018.html;jsessionid=03D59560FAB4B3864BE8A5227660150E.2_cid383?nn=4491044

You get this message, because your browser did not report a valid "referrer".