Update STATE ESTIMATION FOR ROBOTICS

README.md

@@ -25,7 +25,7 @@ Simultaneous Localization and Mapping, also known as SLAM, is the computational
 
 
 ### Books
-- [State Estimation for Robotic -- A Matrix Lie Group Approach](http://asrl.utias.utoronto.ca/~tdb/bib/barfoot_ser15.pdf) by Timothy D. Barfoot, 2016
+- [State Estimation for Robotic -- A Matrix Lie Group Approach](http://asrl.utias.utoronto.ca/~tdb/bib/barfoot_ser17.pdf) by Timothy D. Barfoot, 2018
 - [Simultaneous Localization and Mapping for Mobile Robots: Introduction and Methods](http://www.igi-global.com/book/simultaneous-localization-mapping-mobile-robots/66380) by Juan-Antonio Fernández-Madrigal and José Luis Blanco Claraco, 2012
 - [Simultaneous Localization and Mapping: Exactly Sparse Information Filters ](http://www.worldscientific.com/worldscibooks/10.1142/8145/) by Zhan Wang, Shoudong Huang and Gamini Dissanayake, 2011
 - [Probabilistic Robotics](http://www.probabilistic-robotics.org/) by Dieter Fox, Sebastian Thrun, and Wolfram Burgard, 2005