diff --git a/ch01.asciidoc b/ch01.asciidoc
index 9b4f697..ab34216 100644
--- a/ch01.asciidoc
+++ b/ch01.asciidoc
@@ -93,7 +93,12 @@ Links:
 * https://en.bitcoin.it/w/index.php?title=Contract&oldid=36712#Example_7:_Rapidly-adjusted_.28micro.29payments_to_a_pre-determined_party
 
 
-* Multiple white papers (Joseph Poon, Thaddeus Dryja - https://lightning.network/lightning-network-paper.pdf / Christian Decker, Roger Wattenhoffer -  https://tik-old.ee.ethz.ch/file/716b955c130e6c703fac336ea17b1670/duplex-micropayment-channels.pdf)
+* Multiple white papers 
+** Joseph Poon, Thaddeus Dryja - The Bitcoin Lightning Network:
+Scalable Off-Chain Instant Payments https://lightning.network/lightning-network-paper.pdf  
+** Christian Decker, Roger Wattenhoffer - A Fast and Scalable Payment Network with
+Bitcoin Duplex Micropayment Channels
+ https://tik-old.ee.ethz.ch/file/716b955c130e6c703fac336ea17b1670/duplex-micropayment-channels.pdf
 * Milan meeting and creation of BOLTs
 * segwit activation
 * passing of integration tests / mainnet launch