@article{Hsu_2012,
    doi = {10.1016/j.jcss.2011.12.025},
    url = {https://doi.org/10.1016%2Fj.jcss.2011.12.025},
    year = {2012},
    month = {sep},
    publisher = {Elsevier {BV}},
    volume = {78},
    number = {5},
    pages = {1460--1480},
    author = {Daniel Hsu and Sham M. Kakade and Tong Zhang},
    title = {A spectral algorithm for learning Hidden Markov Models},
    journal = {Journal of Computer and System Sciences}
}

@article{Hsu_2012, doi = {10.1016/j.jcss.2011.12.025}, url = {https://doi.org/10.1016%2Fj.jcss.2011.12.025}, year = {2012}, month = {sep}, publisher = {Elsevier {BV}}, volume = {78}, number = {5}, pages = {1460--1480}, author = {Daniel Hsu and Sham M. Kakade and Tong Zhang}, title = {A spectral algorithm for learning Hidden Markov Models}, journal = {Journal of Computer and System Sciences} }