Update README.md

Author: egpivo

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@@ -71,7 +71,7 @@ For more details, refer to the [Demo](https://egpivo.github.io/SpatPCA/articles/
 [Wen-Ting Wang](https://www.linkedin.com/in/wen-ting-wang-6083a17b) ([GitHub](https://www.github.com/egpivo))
 
 ## Reference
-Wang, W.-T. and Huang, H.-C. (2017). [Regularized principal component analysis for spatial data](https://arxiv.org/pdf/1501.03221v3.pdf, "Regularized principal component analysis for spatial data"). *Journal of Computational and Graphical Statistics*, **26**, 14-25.
+Wang, W.-T. and Huang, H.-C. (2017). [Regularized principal component analysis for spatial data](https://arxiv.org/pdf/1501.03221v3.pdf), "Regularized principal component analysis for spatial data"). *Journal of Computational and Graphical Statistics*, **26**, 14-25.
 
 ## License
 GPL (>= 2)