Schmid, BeatBeatSchmidKlose, MartinaMartinaKloseLechner, UlrikeUlrikeLechnerTan, Y. -H.Thoen, W.2023-04-132023-04-131999https://www.alexandria.unisg.ch/handle/20.500.14171/60466enMedia - A Formal Model of Communities and Platformsworking paper