Fialowski, A., P&, Fuchs, E., Fuchs, E., Khesin, B., Kirillov, A., Malikov, F., Ovsienko, V., Sossinsky, A., Tabachnikov, S., #233, Hungary, USA, USA, Canada, USA, California,USA, France, Russia, USA, 2020. On the 80th Birthday of Dmitry Borisovich Fuchs.. https://doi.org/10.3842/sigma.2020.023