@article{TUW-103127, author = {Matz, Gerald and Hlawatsch, Franz and Kozek, Werner}, title = {Generalized evolutionary spectral analysis and the Weyl spectrum of nonstationary random processes}, journal = {IEEE Transactions on Signal Processing}, year = {1997}, volume = {vol. 45}, number = {no. 6}, pages = {1520--1534}, url = {http://publik.tuwien.ac.at/files/pub-et_3361.pdf} }