%0 Journal Article %A Swift, Randall J. %T Signal extraction for a class of nonstationary processes. %J Portugaliae mathematica %D 2000 %P 49-58 %V 57 %N 1 %I mathdoc %U http://geodesic.mathdoc.fr/item/PORMA_2000__57_1_48608/ %G en %F PORMA_2000__57_1_48608