From 540d23bff03bedbc8f68287d71c8b5e7dc54b054 Mon Sep 17 00:00:00 2001
From: Prefetch
Date: Mon, 8 Mar 2021 15:04:06 +0100
Subject: Expand knowledge base

---
 .../concept/wentzel-kramers-brillouin-approximation/index.pdc | 11 ++++++++++-
 1 file changed, 10 insertions(+), 1 deletion(-)

(limited to 'content/know/concept/wentzel-kramers-brillouin-approximation/index.pdc')

diff --git a/content/know/concept/wentzel-kramers-brillouin-approximation/index.pdc b/content/know/concept/wentzel-kramers-brillouin-approximation/index.pdc
index 482650e..cf44fc8 100644
--- a/content/know/concept/wentzel-kramers-brillouin-approximation/index.pdc
+++ b/content/know/concept/wentzel-kramers-brillouin-approximation/index.pdc
@@ -14,7 +14,7 @@ markup: pandoc
 # Wentzel-Kramers-Brillouin approximation
 
 In quantum mechanics, the **Wentzel-Kramers-Brillouin** or simply the **WKB
-approximation** is a method to approximate the wave function $\psi(x)$ of
+approximation** is a technique to approximate the wave function $\psi(x)$ of
 the one-dimensional time-independent Schrödinger equation. It is an example
 of a **semiclassical approximation**, because it tries to find a
 balance between classical and quantum physics.
@@ -196,3 +196,12 @@ In the classical region ($E > V$), the wave function oscillates, and
 in the quantum-mechanical region ($E < V$) it is exponential. Note that for
 $E \approx V$ the approximation breaks down, due to the appearance of
 $p(x)$ in the denominator.
+
+
+## References
+1.  D.J. Griffiths, D.F. Schroeter,
+    *Introduction to quantum mechanics*, 3rd edition,
+    Cambridge.
+2.  R. Shankar,
+    *Principles of quantum mechanics*, 2nd edition,
+    Springer.
-- 
cgit v1.2.3