DOC Fix broken link for the paper on cross-validation
@@ -447,7 +447,7 @@ fold cross validation should be preferred to LOO.
* L. Breiman, P. Spector `Submodel selection and evaluation in regression: The X-random case
<http://digitalassets.lib.berkeley.edu/sdtr/ucb/text/197.pdf>`_, International Statistical Review 1992;
* R. Kohavi, `A Study of Cross-Validation and Bootstrap for Accuracy Estimation and Model Selection
- <http://web.cs.iastate.edu/~jtian/cs573/Papers/Kohavi-IJCAI-95.pdf>`_, Intl. Jnt. Conf. AI
+ <https://www.ijcai.org/Proceedings/95-2/Papers/016.pdf>`_, Intl. Jnt. Conf. AI
* R. Bharat Rao, G. Fung, R. Rosales, `On the Dangers of Cross-Validation. An Experimental Evaluation
<https://people.csail.mit.edu/romer/papers/CrossVal_SDM08.pdf>`_, SIAM 2008;
* G. James, D. Witten, T. Hastie, R Tibshirani, `An Introduction to
