19 X NGGN GeoGebra-conference in Tartu
Sep 20 – 22, 2019
Mikko Rahikka (Owner)
Svetlana Yushmanova
Anders Karlsson (Matteskolan)
Sirje Pihlap
Bjarnheiður Kristinsdóttir
Lauri Hellsten
Rangel Himmaste
Sirje Sild