fixed readme

diff --git a/readme.md b/readme.md
index 8c73956714e61af13e60336e0d8cd9d097abc4eb..5501d7015b92e5f4ffb621db798ee340034a8d6c 100644 (file)
--- a/readme.md
+++ b/readme.md
@@ -84,6 +84,7 @@ References
   - *SkipListMap*, *SkipListSet*: [2008] Maurice Herlihy, Nir Shavit "The Art of Multiprocessor Programming"\r
   - *BronsonAVLTreeMap* - lock-based fine-grained AVL-tree implementation: \r
         [2010] Nathan Bronson, Jared Casper, Hassan Chafi, Kunle Olukotun "A Practical Concurrent Binary Search Tree"\r
+        [pdf](https://ppl.stanford.edu/papers/ppopp207-bronson.pdf)\r
         \r
 *Ordered single-linked list*\r
   - *LazyList*: [2005] Steve Heller, Maurice Herlihy, Victor Luchangco, Mark Moir, William N. Scherer III, and Nir Shavit "A Lazy Concurrent List-Based Set Algorithm"\r