@InProceedings{berthold2005guidelines,
	author = {Berthold, Ulrich and Jondral, Friedrich K},
	title = {Guidelines for designing OFDM overlay systems},
	booktitle = {Proc. IEEE International Symposium on New Frontiers in Dynamic Spectrum Access Networks (DySPAN)},
	pages = {626–629},
	year = {2005},
}