Update README.md

README.md

@@ -4,7 +4,7 @@ Statististical appearance models for finite element simulations of the femur.
 
 The code is written in C++ using ITK for image processing and analysis, VTK for mesh handling and visualization, and Qt for the user interface. 
 
-If you use this code, please cite the [paper](http://www.mauricioreyes.me/Publications/BonarettiMEP2014.pdf):  
+If you use this code, please cite the paper:  
 Bonaretti S., Seiler C., Boichon C., Reyes M., Büchler P.   
 [**Image-based vs. Mesh-based Statistical Appearance Model of the Human Femur: Implications for Finite Element Simulations.**](http://www.mauricioreyes.me/Publications/BonarettiMEP2014.pdf)  
 Medical Engineering and Physic. Dec;36(12):1626-35. 2014.