From 79af1e1a4f22ec82505261b166aa04ef67112f53 Mon Sep 17 00:00:00 2001
From: Atsushi Sakai <asakai.amsl+github@gmail.com>
Date: Sat, 26 May 2018 16:43:11 +0900
Subject: [PATCH] Ref for state lattice planner is added

---
 README.md | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/README.md b/README.md
index 71bb7c6b..c642a06d 100644
--- a/README.md
+++ b/README.md
@@ -362,6 +362,12 @@ This script is a path planning code with state lattice planning.
 
 This code uses the model predictive trajectory generator to solve boundary problem.
 
+Ref: 
+
+- [Optimal rough terrain trajectory generation for wheeled mobile robots](http://journals.sagepub.com/doi/pdf/10.1177/0278364906075328)
+
+- [State Space Sampling of Feasible Motions for High-Performance Mobile Robot Navigation in Complex Environments](http://www.frc.ri.cmu.edu/~alonzo/pubs/papers/JFR_08_SS_Sampling.pdf)
+
 
 ### Uniform polar sampling