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@article{TUW-110686,
    author = {Matz, Gerald and Hlawatsch, Franz},
    title = {Nonstationary Spectral Analysis Based on Time-Frequency Operator Symbols and Underspread Approximations},
    journal = {IEEE Transactions on Information Theory},
    year = {2006},
    volume = {Vol. 52},
    number = {3},
    pages = {1067--1086},
    url = {http://publik.tuwien.ac.at/files/pub-et_11618.pdf}
}