Bibtex entry: Synthesis of Planar Arrays With Elements in Concentric Rings in ccm.bib
@Article{Azevedo2011a,
  Title                    = {Synthesis of Planar Arrays With Elements in Concentric Rings},
  Author                   = {Azevedo, J.~A.~R.~},
  Journal                  = {Antennas and Propagation, IEEE Transactions on},
  Year                     = {2011},
  Month                    = {march},
  Number                   = {3},
  Pages                    = {839 -845},
  Volume                   = {59},
  Doi                      = {10.1109/TAP.2010.2102999},
  ISSN                     = {0018-926X},
  Keywords                 = {antenna radiation patterns;array factor;azimuthal direction;concentric circular arrays;concentric ring arrays;fast Fourier transform;planar arrays;ripple structure;shaped beam antennas;sidelobe levels;source distribution;antenna radiation patterns;fast Fourier transforms;planar antenna arrays;},
  Owner                    = {jluis},
  Timestamp                = {2012.10.01}
}