@InProceedings{chain-letter-estimation,
  author =	 {Flavio Chierichetti and Jon Kleinberg and David
                  Liben-Nowell},
  title =	 {Reconstructing Patterns of Information Diffusion
                  from Incomplete Observations},
  booktitle =	 {Proceedings of the 25th Annual Conference on Neural
                  Information Processing Systems (NIPS'11)},
  year =	 2011,
  month =	 dec,
  pages =	 {792--800},
  year =	 2011
}