@article{TUW-110080, author = {Papandreou, A. and Hlawatsch, Franz and Boudreaux-Bartels, G.F.}, title = {The hyperbolic class of quadratic time-frequency representations - Part I: Constant-Q warping, the hyperbolic paradigm, properties, and members}, journal = {IEEE Transactions on Signal Processing}, year = {1993}, volume = {vol. 41}, number = {no. 12}, pages = {3425--3444}, url = {http://publik.tuwien.ac.at/files/pub-et_10990.pdf} }