@article{SugSuzNakKasBunKaw08Direct,
    author = {Sugiyama, M. and Suzuki, T. and Nakajima, S. and Kashima, H. and von B\"unau, P. and Kawanabe, M.},
    TITLE = "Direct Importance Estimation for Covariate Shift Adaptation",
    JOURNAL = "Annals of the Institute of Statistical Mathematics",
    VOLUME = "60",
    NUMBER = "4",
    PAGES = "699-746",
    YEAR = "2008",
    doi = "10.1007/s10463-008-0197-x"
}