Johannes Christian Horst Krieger Andreas Holzinger Reinhold Behringer Virtual and Mixed Reality Interfaces for e-Training: Examples of Applications in Light Aircraft Maintenance. 520-529 2007 conf/hci/2007-7 HCI (7) http://dx.doi.org/10.1007/978-3-540-73283-9_58 db/conf/hci/hci2007-7.html#ChristianKHB07