Add doi reference to paper

README.md

@@ -2,7 +2,7 @@ mesh_segmentation
 =================
 
 A simple python addon for blender using spectral clustering to segment meshes. Uses [numpy](http://www.numpy.org/) and [scipy](http://www.scipy.org/) for matrix calculations.
-Developed as a project for the spectral-clustering course of University Bremen. Based on the paper "Segmentation of 3D Meshes through Spectral Clustering" by Rong Liu and Hao Zhang.
+Developed as a project for the spectral-clustering course of University Bremen. Based on the paper "Segmentation of 3D Meshes through Spectral Clustering" by Rong Liu and Hao Zhang (https://doi.org/10.1109/PCCGA.2004.1348360).
 ### Usage
 
  - Install [scipy](http://scipy.org/install.html) in the Python installation that is used by Blender. On Linux this should usually be the system Python, so simply installing *scipy* with your package manager should work. On Windows there will usually be a separate Python installation coming with Blender, so it's a bit more tricky. Perhaps the simplest way is to open a command prompt or power shell with admin rights, navigate to "YOUR_BLENDER_PATH/python/bin" and run `./python -m ensurepip` followed by `./python -m pip install scipy`

src/mesh_segmentation/__init__.py

@@ -1,3 +1,7 @@
+# Mesh segmentation through spectral clustering. Based on "Segmentation of 3D
+# Meshes through Spectral Clustering" by Rong Liu and Hao Zhang
+# (https://doi.org/10.1109/PCCGA.2004.1348360).
+
 bl_info = {
     "name": "Mesh Segmentation",
     "description": "Segments an object and applies an action on each segment",