diff --git a/_posts/2016-12-05-welcome.md b/_posts/2016-12-05-welcome.md
index 8a81fb7..538ca66 100644
--- a/_posts/2016-12-05-welcome.md
+++ b/_posts/2016-12-05-welcome.md
@@ -18,3 +18,4 @@ Resources:
 - [Spoonnet: another experimental hardfork](https://lists.linuxfoundation.org/pipermail/bitcoin-dev/2017-February/013542.html) by Dr Johnson Lau, 2017/2/6
 - [Draft BIP: Extended block header hardfork](https://lists.linuxfoundation.org/pipermail/bitcoin-dev/2017-April/013964.html) by Dr Johnson Lau, 2017/4/2
 - [GitHub BitcoinHardfork development repository](https://github.com/BitcoinHardfork/bitcoin) by Luke-Jr, 2017 July (ongoing)
+- [Atomically Trading with Roger: Gambling on the success of a hardfork](http://homepages.cs.ncl.ac.uk/patrick.mc-corry/atomically-trading-roger.pdf) by Patrick McCorry, Ethan Heilman and Andrew Miller, 2017/07/12