jabed-umar · PeithonKing · Apr 9, 2026 · Mar 27, 2026 · Apr 8, 2026 · Apr 8, 2026
diff --git a/docs/examples/DoS_Calculation.ipynb b/docs/examples/DoS_Calculation.ipynb
diff --git a/docs/getting_started/custom_hoppings.ipynb b/docs/getting_started/custom_hoppings.ipynb
diff --git a/docs/getting_started/k_space_hamiltonian.ipynb b/docs/getting_started/k_space_hamiltonian.ipynb
diff --git a/docs/getting_started/obc_vs_pbc.ipynb b/docs/getting_started/obc_vs_pbc.ipynb
@@ -45,12 +45,12 @@
   },
   {
    "cell_type": "code",
-   "execution_count": 11,
+   "execution_count": null,
    "id": "ba16f8e5",
    "metadata": {},
    "outputs": [],
    "source": [
-    "# Parameters for a ~9.43 degree twist\n",
+    "# Parameters for around ~9.43 degree twist\n",
     "params = {\n",
     "    \"latticetype\": HexagonalLayer,\n",
     "    \"ll1\": 3, \"ll2\": 4, \"ul1\": 4, \"ul2\": 3,\n",
@@ -216,7 +216,7 @@
    "source": [
     "## 5. Spectrum Comparison\n",
     "\n",
-    "The choice of boundary conditions significantly affects the energy eigenvalues. OBC introduces \"edge states\" that may appear in gaps where the bulk (PBC) system has no states."
+    "The choice of boundary conditions significantly affects the energy eigenvalues. For example in a toplogically non trivial system [1] OBC introduces \"edge states\" that may appear in gaps where the bulk (PBC) system has no states."
    ]
   },
   {
@@ -268,6 +268,15 @@
     "This demonstrates how boundary conditions control whether you simulate a finite system or an infinite periodic system."
    ]
   },
+  {
+   "cell_type": "markdown",
+   "id": "7a3805ea",
+   "metadata": {},
+   "source": [
+    "## References\n",
+    "1. Physics with Coffee and Doughnuts: Understanding the Physics Behind Topological Insulators Through Su-Schrieffer-Heeger Model, Batra, Navketan and Sheet, Goutam, 10.1007/s12045-020-0995-x"
+   ]
+  },
   {
    "cell_type": "markdown",
    "id": "85501f0f",

diff --git a/docs/theory/DoS_Calculation.ipynb b/docs/theory/DoS_Calculation.ipynb