From ac254e383f39ca81695e38d07a7c902f94d6b930 Mon Sep 17 00:00:00 2001
From: Pierre de Buyl <pdebuyl@pdebuyl.be>
Date: Mon, 27 Feb 2017 13:43:22 +0100
Subject: [PATCH] add reference to martys99 for quaternions integrator

The source code refers to
http://ciks.cbt.nist.gov/~garbocz/dpd1/dpd.html that is actually the web
version of the (now-)cited article.
---
 doc/ug/otherrefs.bib | 11 +++++++++++
 doc/ug/run.tex       |  3 +++
 2 files changed, 14 insertions(+)

diff --git a/doc/ug/otherrefs.bib b/doc/ug/otherrefs.bib
index e3f21205bd9..178c28275cc 100755
--- a/doc/ug/otherrefs.bib
+++ b/doc/ug/otherrefs.bib
@@ -554,6 +554,17 @@ @ARTICLE{marsili09
   pages = {1106}
 }
 
+@article{martys99,
+  title = {Velocity Verlet algorithm for dissipative-particle-dynamics-based models of suspensions},
+  author = {Martys, Nicos S. and Mountain, Raymond D.},
+  journal = {Phys. Rev. E},
+  volume = {59},
+  issue = {3},
+  pages = {3733--3736},
+  year = {1999},
+  doi = {10.1103/PhysRevE.59.3733}
+}
+
 @ARTICLE{mehlig92,
   author = {Mehlig, B. and Heermann, D. W. and Forrest, B. M.},
   title = {Hybrid Monte Carlo method for condensed-matter systems},
diff --git a/doc/ug/run.tex b/doc/ug/run.tex
index 72cdd9887d3..4048abd9de5 100755
--- a/doc/ug/run.tex
+++ b/doc/ug/run.tex
@@ -81,6 +81,9 @@ \section{\texttt{integrate}: Running the simulation}
   box is assumed.
 \end{itemize}
 
+For systems with the \feature{ROTATION} feature, the integration is done using the
+quaternion-based Velocity Verlet scheme by Martys and Mountain~\cite{martys99}.
+
 \section{\texttt{time_integration}: Runtime of the integration loop}
 \newescommand[time-integration]{time_integration}