Zhuan Ye John Grosspietsch Gokhan Memik Spectrum Sensing Using Cyclostationary Spectrum Density for Cognitive Radios. 1-6 2007 SiPS http://dx.doi.org/10.1109/SIPS.2007.4387507 conf/sips/2007 db/conf/sips/sips2007.html#YeGM07