updated introduction again

bib.bib

@@ -106,3 +106,55 @@ year = {2006}
     title = {VRChat Full Body Tracking},
 }
 
+
+@misc{PAVEL_NUZHDIN_2020,
+    author = {Pavel Nuzhdin},
+    url = {https://exyte.com/blog/vr-full-body-tracking},
+    year = {2020},
+    title = {VR full body tracking: do you really need it?},
+    note = {letzter Zugriff am 4.1.2022},
+}
+
+@misc{VRCHAT_2021,
+    author = {VRCHAT},
+    note = {letzer Zugriff 4.1.2022},
+    year = {2021},
+    title = {Full-Body Tracking},
+    url = {https://docs.vrchat.com/docs/full-body-tracking},
+}
+
+@article{MILGRAM_1994,
+    author = {Milgram, Paul and Takemura, Haruo and Utsumi, Akira and Kishino, Fumio},
+    year = {1994},
+    month = {01},
+    pages = {},
+    title = {Augmented reality: A class of displays on the reality-virtuality continuum},
+    volume = {2351},
+    journal = {Telemanipulator and Telepresence Technologies},
+    doi = {10.1117/12.197321}
+}
+
+@misc{VIVE_2021,
+    author = {VIVE Team},
+    year = {2021},
+    note = {letzter Zugriff 5.1.2021},
+    title = {Comprehensive Tier List for VR Immersion (8 Tiers)},
+    url = {https://blog.vive.com/us/2021/04/14/vr-tiers-immersion-list/},
+}
+
+@inproceedings{BJOERK_2003,
+    author = {Björk, Staffan and Lundgren, Sus and Holopainen, Jussi},
+    year = {2003},
+    month = {01},
+    pages = {},
+    title = {Game Design Patterns}
+}
+
+@article{EMEST_ADAMS_2004,
+    author = {Emest Adams},
+    title = {Postmodenism and the Three Types of Immersion},
+    year = {2004},
+    url = {http://designersnotebook.com/Columns/063_Postmodernism/063_postmodernism.htm}
+}
+
+