diff -r 57e33978e55d -r 3cbcd7cda0a9 ChengsongTanPhdThesis/main.tex
--- a/ChengsongTanPhdThesis/main.tex	Tue Jul 05 00:42:06 2022 +0100
+++ b/ChengsongTanPhdThesis/main.tex	Wed Jul 13 08:27:28 2022 +0100
@@ -46,7 +46,8 @@
 \usepackage{mathpazo} % Use the Palatino font by default
 \usepackage{hyperref}
 \usepackage{lipsum}
-\usepackage[backend=bibtex,style=authoryear,natbib=true]{biblatex} % Use the bibtex backend with the authoryear citation style (which resembles APA)
+\usepackage[backend=bibtex]{biblatex} % Use the bibtex backend with the authoryear citation style (which resembles APA)
+%style=authoryear, natbib=true 
 \usepackage{stmaryrd}
 \usepackage{caption}
 
@@ -71,7 +72,11 @@
 \usepackage{tikz}
 \usetikzlibrary{automata, positioning, calc}
 \usetikzlibrary{fit,
-                shapes.geometric}
+                shapes.geometric,
+		patterns,
+		backgrounds,
+		graphs}
+\usetikzlibrary{babel}
 \usepackage{mathpartir}
 \usepackage{stackrel}