This paper (39 page PDF) explores collaboration in virtual environments. "New forms of VR enable multiple learners to manipulate the same mathematical shapes presented as dynamic objects projected in a joint 3D collaborative space, using intuitive hand gestures." Though positioned as a research paper, it's really a conceptual overview, given that the 'subjects' were "groups of in-service teachers" in different physical locations. That said, it's very comprehensive and provides a really good overview of the subject. The paper itself is a broad survey of different instructional approaches, tracking and measurement, and implications for theories such as embodied cognition.
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