@article{PORMA_1996__53_2_47539,
     author = {Crato, Nuno},
     title = {Some results on the spectral analysis of nonstationary time series.},
     journal = {Portugaliae mathematica},
     pages = {179--186},
     publisher = {mathdoc},
     volume = {53},
     number = {2},
     year = {1996},
     zbl = {0851.62061},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/PORMA_1996__53_2_47539/}
}