From 595a7364781e3284ca72a4e25c6733ca753ad3ef Mon Sep 17 00:00:00 2001
From: Cristian C Lalescu <Cristian.Lalescu@mpcdf.mpg.de>
Date: Wed, 6 Dec 2023 13:04:33 +0100
Subject: [PATCH] adds citation

---
 cpp/kspace.cpp | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/cpp/kspace.cpp b/cpp/kspace.cpp
index 1549b2da..da644032 100644
--- a/cpp/kspace.cpp
+++ b/cpp/kspace.cpp
@@ -338,6 +338,12 @@ void kspace<be, dt>::ball_filter(
  *       \exp(-\frac{(3.54 k \ell)^{122 \ell^{0.0836}}}{2})
  *       \left( 1 + \frac{(k \eta/0.0636)^{3.44}}{1 + (k \eta/ 0.0621)^{3.44}} \right)^{1/2}
  *  \f]
+ *
+ *  Citation:
+ *  Johan Meyers, Charles Meneveau;
+ *  A functional form for the energy spectrum parametrizing bottleneck and intermittency effects.
+ *  Physics of Fluids 1 June 2008; 20 (6): 065109.
+ *  https://doi.org/10.1063/1.2936312
  */
 template <field_backend be,
           kspace_dealias_type dt>
-- 
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