adding citation link on docs

CamDavidsonPilon · Jun 14, 2018 · a72d1f4 · a72d1f4
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diff --git a/docs/index.rst b/docs/index.rst
@@ -49,6 +49,13 @@ Source code and Issue Tracker
 Available on Github, `CamDavidsonPilon/lifelines <https://github.com/CamDavidsonPilon/lifelines/>`_
 Please report bugs, issues and feature extensions there. We also have `Gitter channel <https://gitter.im/python-lifelines/Lobby>`_ open to discuss lifelines: 
 
+Citing lifelines
+------------------------------
+
+The following link will bring you to a page where you can find the latest citation for lifelines:
+
+`Citation for lifelines <http://doi.org/10.5281/zenodo.1252342>`_
+
 
 Indices and tables
 ==================

diff --git a/lifelines/fitters/coxph_fitter.py b/lifelines/fitters/coxph_fitter.py
@@ -573,7 +573,7 @@ def predict_expectation(self, X):
         return pd.DataFrame(trapz(v.values.T, v.index), index=subjects)
 
     def _compute_baseline_hazard(self, data, durations, event_observed, name):
-        # http://courses.nus.edu.sg/course/stacar/internet/st3242/handouts/notes3.pdf
+        # https://stats.stackexchange.com/questions/46532/cox-baseline-hazard
         ind_hazards = self.predict_partial_hazard(data)
         ind_hazards['event_at'] = durations.values
         ind_hazards_summed_over_durations = ind_hazards.groupby('event_at')[0].sum().sort_index(ascending=False).cumsum()