A Systematic Review on the Visualization of Avatars and Agents in AR & VR displayed using Head-Mounted Displays. - Florian Weidner; Gerd Boettcher; Stephanie Arévalo Arboleda; Chenyao Diao; Luljeta Sinani; Christian Kunert; Christoph Gerhardt; Wolfgang Broll; Alexander Raake (IEEE Trans. Vis. Comput. Graph., 2023)