diff --git a/201 Metadata/My Library.bib b/201 Metadata/My Library.bib
index efb04b02b..cb3cb6d88 100644
--- a/201 Metadata/My Library.bib	
+++ b/201 Metadata/My Library.bib	
@@ -2144,6 +2144,20 @@ Opportunities and Challenges toward Responsible AI.pdf}
   file = {/home/danesabo/Zotero/storage/CDGP72KV/CH2_Sampled_Data_Analysis_Unfilled(1).pptx;/home/danesabo/Zotero/storage/GJGSRZXQ/CH2_Sampled_Data_Analysis_Unfilled.pdf}
 }
 
+@article{CH3ZTransformDifference,
+  title = {{{CH3 The}} Z-{{Transform}} and the {{Difference Equation}}},
+  journaltitle = {DIGITAL CONTROL SYSTEMS},
+  langid = {english},
+  file = {/home/danesabo/Zotero/storage/YVUXYFW8/Chapter 3 The z-Transform and the Difference Equation.pdf}
+}
+
+@online{CH4System_Representation_S2020pdf2254,
+  title = {{{CH4 System}}\_{{Representation}}\_{{S2020}}.Pdf: 2254 {{ME}} 2046 {{SEC1000 DIGITAL CONTROL SYSTEMS}}},
+  url = {https://canvas.pitt.edu/courses/301794/files/19520682?module_item_id=5521302},
+  urldate = {2025-01-23},
+  file = {/home/danesabo/Zotero/storage/V4AZ95G2/Chap4_System_Representation_S2020.pdf 2254 ME 2046 SEC1000 DIGITAL CONTROL SYSTEMS.pdf}
+}
+
 @incollection{championKindModelChecker2016,
   title = {The {{Kind}} 2 {{Model Checker}}},
   booktitle = {Computer {{Aided Verification}}},
@@ -2179,6 +2193,12 @@ Opportunities and Challenges toward Responsible AI.pdf}
   file = {/home/danesabo/Zotero/storage/B654ZQJB/Reasoning about Bayesian Network Classifiers}
 }
 
+@online{Chap4_System_Representation_S2020pdf2254MEa,
+  title = {Chap4\_{{System}}\_{{Representation}}\_{{S2020}}.Pdf: 2254 {{ME}} 2046 {{SEC1000 DIGITAL CONTROL SYSTEMS}}},
+  url = {https://canvas.pitt.edu/courses/301794/files/19520682?module_item_id=5521302},
+  urldate = {2025-01-23}
+}
+
 @article{chappellatElementaryProofsClassical1990,
   title = {Elementary Proofs of Some Classical Stability Criteria},
   author = {Chappellat, H. and Mansour, M. and Bhattacharyya, S.P.},
@@ -2196,13 +2216,6 @@ Opportunities and Challenges toward Responsible AI.pdf}
   file = {/home/danesabo/Zotero/storage/72C8YKGT/Chappellat et al. - 1990 - Elementary proofs of some classical stability crit.pdf;/home/danesabo/Zotero/storage/YLLB6JD5/57067.html}
 }
 
-@article{Chapter3ZTransform,
-  title = {Chapter 3 {{The}} Z-{{Transform}} and the {{Difference Equation}}},
-  journaltitle = {DIGITAL CONTROL SYSTEMS},
-  langid = {english},
-  file = {/home/danesabo/Zotero/storage/YVUXYFW8/Chapter 3 The z-Transform and the Difference Equation.pdf}
-}
-
 @online{charalambousNewEraSoftware2023,
   title = {A {{New Era}} in {{Software Security}}: {{Towards Self-Healing Software}} via {{Large Language Models}} and {{Formal Verification}}},
   shorttitle = {A {{New Era}} in {{Software Security}}},