From 173d347c32698aeb4ad185ecefe07664cdded5fa Mon Sep 17 00:00:00 2001
From: "T. van der Sar" <t.vandersar@tudelft.nl>
Date: Fri, 25 Jan 2019 22:55:08 +0000
Subject: [PATCH] Update 4_sommerfeld_model.md - added reference to chapter of
 book

---
 src/4_sommerfeld_model.md | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/src/4_sommerfeld_model.md b/src/4_sommerfeld_model.md
index 038353d4..bfc3ac07 100644
--- a/src/4_sommerfeld_model.md
+++ b/src/4_sommerfeld_model.md
@@ -7,8 +7,7 @@ from common import draw_classic_axes, configure_plotting
 
 configure_plotting()
 ```
-
-### Sommerfeld theory (free electron model)
+_(based on chapter 4 of the book)_  
 
 !!! summary "Learning goals"
 
@@ -20,6 +19,7 @@ configure_plotting()
     - calculate the electron contribution to the specific heat of a solid.
     - describe central terms such as the Fermi energy, Fermi temperature, and Fermi wavevector.
 
+### Sommerfeld theory (free electron model)
 
 Atoms in a metal provide conduction electrons from their outer shells (often s-shells). These can be described as waves in the crystal, analogous to phonons. Hamiltonian of a free electron:
 
-- 
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