Update README.md

Author: firefly-cpp

README.md

@@ -55,7 +55,7 @@ arm.set is a problem definition file. Check [README](bin/README.txt)
 
 [2] I. Fister Jr., I Fister. Information cartography in association rule mining. arXiv preprint [arXiv:2003.00348](https://arxiv.org/abs/2003.00348), 2020.
 
-[3] I. Fister Jr., V. Podgorelec, I. Fister. Improved Nature-Inspired Algorithms for Numeric Association Rule Mining. In: Vasant P., Zelinka I., Weber GW. (eds) Intelligent Computing and Optimization. ICO 2020. Advances in Intelligent Systems and Computing, vol 1324. Springer, Cham.
+[3] I. Fister Jr., V. Podgorelec, I. Fister. [Improved Nature-Inspired Algorithms for Numeric Association Rule Mining](https://link.springer.com/chapter/10.1007/978-3-030-68154-8_19). In: Vasant P., Zelinka I., Weber GW. (eds) Intelligent Computing and Optimization. ICO 2020. Advances in Intelligent Systems and Computing, vol 1324. Springer, Cham.
 
 
 ## Contributors