@article{neuralvectorspacesforunsupervised,
  title = {Neural Vector Spaces for Unsupervised Information Retrieval},
  author = {Christophe Van Gysel and Maarten de Rijke and Evangelos Kanoulas},
  year = {2017},
  eprint = {1708.02702},
  archivePrefix = {arXiv},
  url = {http://arxiv.org/abs/1708.02702v4},
}