@article{TUW-103349, author = {Matz, Gerald and Hlawatsch, Franz}, title = {Time-frequency subspace detectors and application to knock detection}, journal = {International Journal of Electronics and Communications (AE{\"U})}, year = {1999}, volume = {53}, number = {no. 6}, pages = {379--385}, url = {http://publik.tuwien.ac.at/files/pub-et_3583.pdf} }