update README.md

README.md

@@ -5,7 +5,7 @@ includes a database backend that easily scales to billions of images and
 supports sustained high rates of image insertion: up to 10,000 images/s on our
 cluster!
 
-Based on the paper [_An image signature for any kind of image_, Goldberg et
+Based on the paper [_An image signature for any kind of image_, Wong et
 al](http://www.cs.cmu.edu/~hcwong/Pdfs/icip02.ps).  There is an existing
 [reference implementation](https://www.pureftpd.org/project/libpuzzle) which
 may be more suited to your needs.