DOC Hyperlink DOIs to preferred resolver (#12792)

katrinleinweber · qinhanmin2014 · commit 8f8f3c8374a0 · 2018-12-15T23:36:19.000+08:00
diff --git a/doc/modules/clustering.rst b/doc/modules/clustering.rst
@@ -1789,12 +1789,12 @@ Drawbacks
    "A Cluster Separation Measure"
    IEEE Transactions on Pattern Analysis and Machine Intelligence.
    PAMI-1 (2): 224-227.
-   `doi:10.1109/TPAMI.1979.4766909 <http://dx.doi.org/10.1109/TPAMI.1979.4766909>`_.
+   `doi:10.1109/TPAMI.1979.4766909 <https://doi.org/10.1109/TPAMI.1979.4766909>`_.
 
  * Halkidi, Maria; Batistakis, Yannis; Vazirgiannis, Michalis (2001).
    "On Clustering Validation Techniques"
    Journal of Intelligent Information Systems, 17(2-3), 107-145.
-   `doi:10.1023/A:1012801612483 <http://dx.doi.org/10.1023/A:1012801612483>`_.
+   `doi:10.1023/A:1012801612483 <https://doi.org/10.1023/A:1012801612483>`_.
 
  * `Wikipedia entry for Davies-Bouldin index
    <https://en.wikipedia.org/wiki/Davies–Bouldin_index>`_.
