QUALINET White Paper on Definitions of Immersive Media Experience (IMEx). - Andrew Perkis; Christian Timmerer; Sabina Barakovic; Jasmina Barakovic Husic; Søren Bech; Sebastian Bosse; Jean Botev; Kjell Brunnström; Luís Alberto da Silva Cruz; Katrien De Moor; Andrea de Polo Saibanti; Wouter Durnez; et al. (CoRR, 2020)