Improving neural networks by preventing co-adaptation of feature detectors  [paper]
  
  Geoffrey E. Hinton, Nitish Srivastava, Alex Krizhevsky, Ilya Sutskever, Ruslan R. Salakhutdinov 
  arXiv preprint
   Dropout: A simple way to prevent neural networks from overfitting
[paper][bibtex]
  Nitish Srivastava, Geoffrey E. Hinton, Alex Krizhevsky, Ilya Sutskever, Ruslan R. Salakhutdinov 
  Journal of Machine Learning Research, June 2014.