@proceedings {644, title = {Overlay Spectrum Reuse in a Broadcast Network: Covering the Whole Grayscale of Spaces}, journal = {IEEE Symposium on New Frontiers in Dynamic Spectrum Access Networks (DySPAN 2012)}, year = {2012}, address = {Bellevue, WA}, keywords = {cognitive radio, dynacs}, doi = {10.1109/DYSPAN.2012.6478172}, author = {Alberto Rico-Alvari{\~n}o and C. Mosquera} }