Update README.md

Author: Ryo Yonetani

README.md

@@ -27,7 +27,25 @@ Neural A\* is a novel data-driven search-based planner that consists of a traina
 ## Citation
 
 ```
-# ICML2021 version (to appear)
+# ICML2021 version
+@InProceedings{pmlr-v139-yonetani21a,
+  title =      {Path Planning using Neural A* Search},
+  author    = {Ryo Yonetani and
+               Tatsunori Taniai and
+               Mohammadamin Barekatain and
+               Mai Nishimura and
+               Asako Kanezaki},
+  booktitle =      {Proceedings of the 38th International Conference on Machine Learning},
+  pages =      {12029--12039},
+  year =      {2021},
+  editor =      {Meila, Marina and Zhang, Tong},
+  volume =      {139},
+  series =      {Proceedings of Machine Learning Research},
+  month =      {18--24 Jul},
+  publisher =    {PMLR},
+  pdf =      {http://proceedings.mlr.press/v139/yonetani21a/yonetani21a.pdf},
+  url =      {http://proceedings.mlr.press/v139/yonetani21a.html},
+}
 
 # arXiv version
 @article{DBLP:journals/corr/abs-2009-07476,
@@ -54,4 +72,4 @@ This repository includes some code from [RLAgent/gated-path-planning-networks](h
 
 ## References
 - [1] [Lisa Lee*, Emilio Parisotto*, Devendra Singh Chaplot, Eric Xing, Ruslan Salakhutdinov, "Gated Path Planning Networks", ICML, 2018.](https://arxiv.org/abs/1806.06408)
-- [2] [Marin Vlastelica Pogančić, Anselm Paulus, Vit Musil, Georg Martius, Michal Rolinek, "Differentiation of Blackbox Combinatorial Solvers", ICLR, 2020.](https://arxiv.org/abs/1912.02175)
+- [2] [Marin Vlastelica Pogančić, Anselm Paulus, Vit Musil, Georg Martius, Michal Rolinek, "Differentiation of Blackbox Combinatorial Solvers", ICLR, 2020.](https://arxiv.org/abs/1912.02175)