Update README.md

Mintinson · Apr 13, 2021 · c50669a · c50669a
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@@ -44,7 +44,7 @@ EGO-Planner: An ESDF-free Gradient-based Local Planner for Quadrotors
 **Video Links:** [YouTube](https://youtu.be/UKoaGW7t7Dk), [bilibili](https://www.bilibili.com/video/BV1VC4y1t7F4/) (for Mainland China)
 
 ## 1. Related Paper
-EGO-Planner: An ESDF-free Gradient-based Local Planner for Quadrotors, Xin Zhou, Zhepei Wang, Chao Xu and Fei Gao (Accepted by RA-L). [Preprint](https://arxiv.org/abs/2008.08835) and [Early Access](https://ieeexplore.ieee.org/document/9309347).
+EGO-Planner: An ESDF-free Gradient-based Local Planner for Quadrotors, Xin Zhou, Zhepei Wang, Chao Xu and Fei Gao (Accepted by RA-L). [arXiv Preprint](https://arxiv.org/abs/2008.08835), [IEEE Xplore](https://ieeexplore.ieee.org/abstract/document/9309347), and [IEEE Spectrum report](https://spectrum.ieee.org/automaton/robotics/robotics-hardware/video-friday-mit-media-lab-tf8-bionic-ankle).
 
 ## 2. Standard Compilation