@InProceedings{ketterer1999classification,
	author = {Ketterer, Helmut and Jondral, Friedrich and Costa, Antonio H},
	title = {Classification of modulation modes using time-frequency methods},
	booktitle = {Proc. Int. Conf. Acoustics, Speech, and Signal Process. (ICASSP)},
	pages = {2471–2474},
	year = {1999},
}