bibentry("InProceedings",
    mheader = "If you find this package useful, please cite:",
    key = "sigg2008expectation",
    author = "Christian D. Sigg and Joachim M. Buhmann",
    title = "Expectation-Maximization for Sparse and Non-Negative PCA",
    booktitle = "Proc. 25th International Conference on Machine Learning",
    year = "2008",
    doi = "10.1145/1390156.1390277"
)
