@article{TUW-103083, author = {Papandreou-Suppappola, A. and Hlawatsch, Franz and Boudreaux-Bartels, G.F.}, title = {Quadratic time-frequency representations with scale covariance and generalized time-shift covariance: A unified framework for the affine, hyperbolic, and power classes}, journal = {Digital Signal Processing}, year = {1998}, volume = {8}, pages = {3--48}, url = {http://publik.tuwien.ac.at/files/pub-et_3317.pdf} }