diff --git a/thesis.bib b/thesis.bib
index 6b01ee8..986665a 100644
--- a/thesis.bib
+++ b/thesis.bib
@@ -1703,6 +1703,53 @@ https://docs.google.com/spreadsheets/d/1ymREowDj40tYuA5CXd4IfC4WYPXxlx5hq1x8tQcW
   groups    = {Verwendet},
 }
 
+@InCollection{Lichtenegger_2015a,
+  author         = {Klaus Lichtenegger},
+  booktitle      = {Schlüsselkonzepte zur Physik},
+  publisher      = {Springer Berlin Heidelberg},
+  title          = {{K}lassische {M}echanik},
+  year           = {2015},
+  pages          = {13--47},
+  doi            = {10.1007/978-3-8274-2385-6_2},
+  file           = {:files/Lichtenegger2015_Book_SchlüsselkonzepteZurPhysik.pdf:PDF},
+  groups         = {Verwendet},
+  qualityassured = {qualityAssured},
+}
+
+@Article{Moldenhauer_2018a,
+  author    = {Laura Moldenhauer and Rosemarie Helmerich and Enrico Köppe and Jochen Wittmann},
+  journal   = {Materials Today: Proceedings},
+  title     = {Experimental modeling approach for determining the moisture damping exponent of a bluetooth low energy signal in moist building material},
+  year      = {2018},
+  number    = {13},
+  pages     = {26609--26614},
+  volume    = {5},
+  doi       = {10.1016/j.matpr.2018.08.124},
+  publisher = {Elsevier {BV}},
+}
+
+@Misc{phyphox,
+  author         = {{RWTH AAchen}},
+  title          = {phyphox®},
+  year           = {2021},
+  file           = {:phyphox - Phyphox&reg\;.html:URL},
+  groups         = {Verwendet},
+  qualityassured = {qualityAssured},
+  url            = {https://phyphox.org},
+  urldate        = {2022-02-15},
+}
+
+@Misc{puckjs,
+  author         = {{Pur3 Ltd}},
+  title          = {{P}uck.js - the {J}ava{S}cript {B}luetooth {B}eacon},
+  year           = {2020},
+  file           = {:puckjs - Puck.js the JavaScript Bluetooth Beacon.html:URL},
+  groups         = {Verwendet},
+  qualityassured = {qualityAssured},
+  url            = {https://www.puck-js.com/},
+  urldate        = {2021-12-20},
+}
+
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