@article{TUW-110052, author = {Hlawatsch, Franz and Kozek, Werner}, title = {Time-frequency projection filters and time-frequency signal expansions}, journal = {IEEE Transactions on Signal Processing}, year = {1994}, volume = {vol. 42}, number = {no. 12}, pages = {3321--3334}, url = {http://publik.tuwien.ac.at/files/pub-et_10962.pdf} }