Integration scenarios of virtual worlds in learning management systems using the MULTIS approach. - Morgado, Leonel; Paredes, Hugo; Fonseca, Benjamim; Martins, Paulo; Almeida, Álvaro; Vilela, Andreas; Pires, Bruno; Cardoso, Márcio; Peixinho, Filipe; Santos, Arnaldo (Personal & Ubiquitous Computing, 2017)